facebook linkedin twitter blogspot
you google pinterest tumblr
E-mail:info@navneetgems.com
Contact Number : +66-818323858

Latest News from Gemstone Industry

Know everything about calibrated and big size Rhodolite Garnet - doing all colors of Rhodolite including Raspberry, Purple & Umbalite Garnet

Rhodolite Garnet introduction and etymology -Garnet is a gemstone which have more than ten different colors and all are known by different names, although all garnets share the crystal structure. Basically it is divided into two braches based on aluminum and calcium. Pyrope, almandite, rhodolite, malaya and spessartite are called aluminum garnets and uvarovite, anaradite, demantoid, hessonite, tsavorite are calcium garnets. Word ‘Rhodolite’ is derived from the Greek word, "rhodon", which means "rose coloured". Rhodolite is one the most valuable type of garnet. Saturation and tone are very important in this. It comes in reddish purple to purplish raspberry red, vivid raspberry-red color is the most valued one. Price graph depends on size of stone and color, over 10 carat stones prices are high. If we talk about composition and chemical structure of this stone then it is a mixture of two garnets – Pyrope and Almandine. An inclusion free, vitreous luster and raspberry red color garnet is perfect piece of this stone.  

When we talk about chemical structure and minerals then scietifically it comes in Cubic, rhombic dodecahedron structure and chemical formula is Magnesium aluminium silicate. It has 6.5-7.5 hardness on mohs scale, instict cleavage, Vitreous luster.

Sources, market, color chart and price overview on rhodolite garnet - This stone was first found in North Carolina (America). In 1880s and 1890s, that time most of the raw material came from alluvial deposit. Nowadays Tanzania, Sri Lanka, Burma, China, Madagascar and Kenya are biggest sources for raw material of this gem. We are sourcing raw material from different countries as market demand is for different qualities and color. Mainly we deal big sizes stones, though we manufacture and supply calibrated also. Rhodolite garnet, according to gemval has increased in prices by 2 fold since the year 2014 started. We got in the Rhodolite garnet business in 2010, since then we have supplied many orders of raspberry rhodolites, umbalites (very recent and new), and A, AA and AAA colors of Rhodolite garnets. Our Navneet Gems and Minerals' color chart is attached here at the bottom:

Rhodolite Garnet Color chart Navneet Gems

 Navneet Gems and Minerals has come up with this unique color chart for Rhodolite garnet as our customers have been very confused since they have been ordering this type of Garnet from different suppliers and getting very mixed colors and variable qualities. We at Navneet Gems and Minerals has very strict color policy and our selection staff follow this above Rhodolite garnet color chart very strongly. There are so many different colors in Rhodolite that if we had to make a full color chart,  think there would more than 15 different shades and thus we came up with a simple version.

The last two are Raspberry rhodolite garnet which is a Pinkish purple shade of Rhodolite garnet, the top most, but recently the Umbalite have started to show up back in the market with some quantifiable produciton quantities. Earlier the quantity and the quality most importantly were very low.

We at Navneet Gems and Minerals are able to produce 1,000 pieces of Rhodolite garnet every day, we produce almost all shapes and sizes from 2 mm round upto large freesize stones. Have a look at the different shades, sizes, shapes of Rhodolite garnets we can produce at wholesale prices. If you have any price inquiries or would like to source some high end Umbalite garnets, get in touch with us today!

  Garnet OvalsUmbalites & Raspberrys mixed

Rhodolite garnet

This picture is clicked from our stock and all these pieces are cut and finished in our own factory which is situated in Bangkok, Thailand. We have many pieces like this lot.

Creative jewelry ideas based on trends and market -
Small designers to big jewelry companies all are using this stone in rings, bracelets, pendants and necklaces. As metal, they are using silver and gold in their designs. To minimize the total cost of jewelry piece, they are using white topaz, smoky quartz, amethyst and other stones. From red carpets to engagement ring, rhodolites have been using all around the world. Jewelry companies are using small sizes from 1.5mm to 3mm mainly in rings and in center they are using green color stone.

Mainly our customers are from the United States, Europe, Australia and Canada, some of them are jewelry designers and collectors and users and big jewelry companies. We specialize in big sizes rhodolites over 6 carats in ovals, rounds, pear, octagon, heart and other shapes. We have AA to AAA grade in this. As mentioned above about small size designs and uses, due to regular demands of micro size we always keep in stock and take only few hours to ship our customers.
An iris brooch designed by Tiffany and co designer Paulding Farnham to gift her wife
An iris brooch designed by Tiffany and co designer Paulding Farnham to gift her wife, by using demantoid garnet, rhodolite and diamonds.

 Actress, Sanaa Lathan wore an amazing pair of rhodolite garnet earrings in 2012 (NAACP Image Awards)
Actress Sanaa Lathan wore an amazing pair of rhodolite garnet earrings in 2012 (NAACP Image Awards)

Many times readers need to know about cleaning of garnet so here we are-
Rhodolite garnet gemstones' hardness is good so it is not delicate like other soft stones but still proper care is important. Proper care includes to protect from hard blows, which can damage the garnet stones. Our experts suggestion is to use soapy water and soft cloth to clean the stone.  To clean your rhodolite garnets, simply use warm soapy water and a soft cloth. Be sure to rinse well to remove soapy residue. Make sure when you use the brush to remove sticky particles then you don't use metal one that can scratch your stone. Other chemicals and ultrasonic cleanners are high prohibited. When you see garnet gemstones then make sure to keep stones sepearte in big sizes especially.

Rhodolite Garnet Gemstone

Contact us for loose calibrated and free size rhodolite gems -
You can send us inquiry through contact us form or find our email address at top, in right hand of the banner. We will reply you back with pictures, prices and other info within few hours. We have an online sales team of 4 people and all are experienced more than 5 years, their job is to reply each and every inquiry we get in a proper way with pictures, prices and quality information. We focus on pictures so we can show to our customers exactly what they are going to receive from us. We are not like other wholesale gemstone suppliers who keep their customers in dark and after receiving the goods their customers loose the money. We keep everything transparent with our customers and inform them prior delivery.

© 2014 Navneetgems.com all rights reserved.

Posted on Monday, August 18, 2014 - 11:12

The Rise of Single Handed Jewelry Designers

Jewelry is something that people choose to wear on special occasions. These jewelries are a symbol of social status and people opt for them for looking more elite and classy than others. it will be no harm saying that the jewelries boost up the confidence of the person wearing them. A jewelry item matched with good dress will definitely bring you ahead of others. Due to all these reasons; the rise in the jewelry designs have been seen and to cop up with these demands; we have witnessed the emergence of single handed jewelry designers.

The term single handed jewelry designers can be used for the small scale jewelry designers that handle the production and design of the jewelries on a small scale. Over the recent years; there have been lots of individual designers that have marked their presence in the market. Unlike the top brands; these small level jewelers are trying to make their presence marked and felt in the market and for that reason being; these designers take good care of their customers. It is often seen that the services rendered by these designers are even better than comparatively bigger and corporate kind of the jewelry brands.

America has been a great jewelry market and over the years and the consumption of the jewelries in the American market has only increased and not witnessed any fall. Although there have been shifts in the jewelry trends but overall jewelry market has not suffered ever a major setback.

To support what I wrote; I would like to present a statistical report of that:

US Jewelry Sales Chart 2012-2013

Thus it leads to the existence and rise of the small American designers making jewelries. Although these jewelers have increased in the numbers; their service areas are limited. These designers often take care of the people living in their nearby locality and to highest extent, in their city.

And not just American but there is various other countries also that are encouraging and supporting the SMEs in the field of Jewelries. Take a case of Thailand for instance:

This gives the consumer a natural advantage of being in touch with the designer whenever it is needed. Also as belonging from the same locality most of the times; a trust factor and a bond can be seen building up between them. That bond and the trust are the main reasons for the success and rise of the new Small and Medium Enterprises emerging in the field of jewelry designs. Out of the many things turning to be good from these SMEs; one in particular is that they develop designs that are often unique.

Since most of the work is done on the individual requirements; there are slightest of chances that any design that is wore by one is going to be tagged as common. Everyone gets the unique design that they ordered for and thus they don’t have to choose only from the fancy catalogues and showcases they see in the top brands showroom. Rise of these SMEs in the field of jewelries have been a good indication so far and now there is no doubt that they meet the requirement of the local area in a much better manner.     

Posted on Saturday, August 16, 2014 - 11:06

Is Victorian Jewelry the New Jewelry Trend?

Since the ancient times, mankind have shown keen interest in adoring himself for occasions that are special to him. Both men and women try to look their best when they get a chance to be in a special occasion in any sort of social gathering. Now while clothes play their own part in making them look good for any particular occasion, the main emphasis and the thing that attracts the most is the jewelry. Being attracted to a beautiful jewelry is one common trait of humans living all over the world.

This attraction and interest of people for jewelry is the thing that makes jewelry precious apart from their constituent. As they say that change is the rule of the nature and that applies to almost everything on the world, so changes in the jewelry trend are also pretty obvious. When we talk about the jewelry trend, it can be seen that the latest sell reports and surveys suggest that Victorian jewelry is in trend. And after taking a good look at this image, I think you will understand why they are gaining popularity constantly.  

Victorian Jewelry

Victorian Jewelry is the type of the jewelry which was made during the period of reign of Queen Victoria or in some cases was modeled after it. From the historical point of view, one can see that the Victorian Era (1837 to 1901) was a prominent era. This was the era which reflected romance and elegance in its reign. If two very particular things of royal families are talked about, it can be seen that they are their style statements and etiquettes. Victorian era was no exception and in that period it was seen that there was huge emphasis on the firm rules regarding the dressing modes and social etiquettes.

The most remarkable thing about the Victorian jewelry is that since they were handmade, a very high level of artisan skills was reflected by them. Even those jewelries that were fabricated in the factories, the supervision of experienced jewelers marked a note of individuality even on the machine made jewelries. These jewelries were designed for every section of the society. Only difference being while the rich people used to wear precious stones in their jewelry sets, the less rich people wore glasses in their jewelry.

Also these jewelries were designed for each and every type of occasion of people’s life. Though it may sound surprising but there were mourning jewelry that became quite famous in the Victorian era.

And to support the above stated fact, here is a link to the video that shows some of the beautiful works of the Victorian era:

Victorian jewelry was famous and gained popularity like wildfire. Even to this date, there are millions of people who choose Victorian jewelry compared to anything else. Reason being simple, while these give a classy touch and elegance to the person wearing it, it is an investment that you will never regret making.

Though there is a limited amount of original Victorian Jewelry available, there are lots of factories that are producing jewelries which are highly inspired by the Victorian jewelry.

Posted on Saturday, August 16, 2014 - 10:58

Are Diamonds Out of Fashion Now?

There are 2 famous sayings that depicts the very nature of universe that we live in. first being ‘Change is the rule of the nature’ and second being ‘Necessity is the mother of Invention’. Everything witnesses a change after a particular period of time and while the change is welcomed or not, it is destined to happen. And if ever the need for anything was felt with desperation and amongst the masses, that thing was discovered and invented eventually. Diamonds had a good reign for being the most precious gemstone for humans since time unknown. But now it feels like the diamonds are no longer the first preference of even the people who are capable of buying it.

This is the change that we are talking about here, diamonds are out of fashion. Now this one will come as a surprise to you but the diamond jewelries have witnesses a fall in the sells over the recent years. The fall in the sales was an indication of the changing trends. It was the sign that something else was taking over and becoming the preference of the people. These were the fashionable gemstones that were seen dethroning the diamonds. And there is no chance that you don’t fall in love with the beautiful designs that these gemstones come in. For instance let us take a look at this beautiful piece of jewelry made of Emerald:

jewelry made of Emerald

Over the recent years, a tremendous increase in the sales of gemstones was seen. These gemstones came in trend and are now becoming popular in each and every section of the society. From people walking on the street to Hollywood divas walking on the red carpets of the various award functions, these fashionable gemstones are marking their presence everywhere. It has not been very long when Halle Berry was spotted wearing a gemstone engagement ring. Also we see pictures of Angelina Jolie wearing Emerald while she walks on the red carpet of several prestigious award functions. 

Emerald earrings and ring

And if these style Goddesses are wearing the gemstone, there must be a shift in trend in the fashion industry and that’s for sure.  

Not only are these gemstones fashionable and trendy but also these offering almost the same qualities of the diamond. In diamonds versus gemstones, gemstones wins at several points. First of all these gemstones come at quite less prices as compared to the diamonds. Now not everyone can afford the expensive diamonds and if something offering almost same qualities is available at remarkably low prices, what is the harm in that?

Also the gemstones are available in a variety of colors unlike diamonds.

For instance take a look at the video depicting some beautiful works of Gemstone Jewelries:

And it is not the color availability of these gemstones but also these gemstones have qualities like hardness in which they are secondary only to diamonds. Longevity and ruggedness are other features that make gemstones more preferable to diamonds. Also it is for sure that in a price package where you can only afford one set of jewelry with diamonds in it, you can get numerous jewelry sets if you opt for the gemstone jewelry. And who doesn’t like having options?

So for all these reasons, one can see that due to a numerous good reasons, diamonds monopoly over the jewelry market has come to an end.

Posted on Friday, August 15, 2014 - 11:38

Men’s Jewelry: An Emerging Market

Men and women are the equally important parts of the society. They say that men are from Mars and women from Venus. While that is just a saying, it can be always noticed that there are different areas in which men and women are interested in. Not only that they differ in physicality but also a man’s mind is attracted to whole other type of the things than women. While earlier, it was man’s role to earn the bread and butter for the family, in the modern era women are playing an important role in this aspect too. And it is not only this area where the diversion of interests and roles has been seen, there are numerous others. One very important in this is attraction towards the jewelry.

Yeah you read it right, modern man is as attracted to jewelry these days as are the woman. Men are showing much more interests in jewelries than earlier. And with all such beautiful designs available for them to wear on their special occasion, can you expect them to be any less interested. Let us take a look at these beautiful jewelries designed for men:

Men's jewelry


Top Grade Handsome Sainless Steel Jewellery Fashion Jewelry Men's Stick Link Chain Necklace

The first and most important thing that raised the interest of men towards the jewelry is the rings. It is not just the engagement rings that men like to wear, but wearing ring is quite a style statement these days. While some wear it after consulting to their gemstone expert, others wear it as they look cool on them. And we can’t forget the fact that a well designed ring can definitely make you look more elite in comparison to others when matched with the perfect dress. It is reasons like these that a remarkable increase in the men’s rings sales have been seen.

Men’s jewelry sales have been going up.

To support the fact let me present some stats:

Men's & Women's Purchasing Chart

This increase in sales has a number of reasons behind. First being modern men have become more sensible. They just don’t want to be all macho every time. Comparable to men from past generations and years; modern day men are comfortable in their skin. And due to this they are opting for jewelry that not only make them look distinct and elegant at several occasions but also turns out to be a good investment for them. Yes, if you have something that you can flaunt and also is of the nature that its price may raise in the future, why not opt for it.

And if you are wondering what exactly could be the way you wear your jewelry around, this might help you:

This is the right time when someone can make benefit from the boom in the men’s rings and accessories. There is an upward trend seen in men’s jewelry and accessories and there are not even slight chances that this trend is going down easily. Variety of men’s jewelries like bracelets, wedding bands are drawing the attention of a huge population of man. So whether you are a buyer or a seller, there cannot be a better time to opt for the men’s jewelry than this.


Posted on Friday, August 15, 2014 - 11:15

Sourcing Your Wholesale Gemstones Beads From Someone In India/Thailand

Jewelry has dependably been a coveted thing for ladies from aged times. To make gems phenomenal and remarkable, gemstone beads assume an extremely critical part. These days you can discover numerous sorts of valuable gemstone beads and semi valuable gemstone beads utilized within designer jewelries. The gemstone beads are accessible in distinctive shades, shapes, sizes and so forth. You can browse the far reaching range of gemstone beads to plan adornments for yourself or to gift gems to somebody. 

Colours of gemstones beads

Gems produced using elite gemstone beads looks unexpected and traditional.

Semi valuable beads : 

 Semi valuable beads are a perfect decision while outlining enduring interesting gems. There are numerous sorts of semi valuable gemstones accessible in unbelievable shapes sizes & shade from which special adornments can be designed. Tourmaline semi valuable beads are most generally utilized within various types of delightful high quality adornments. Garnet semi valuable beads are world acclaimed for their magnificence and strength as they emanate natural allure embraced by nature. 

Semi valuable beads

There are numerous online stores of semi valuable gemstone beads, where you can purchase unique semi valuable gemstone beads. These semi valuable gemstone bead suits each neck making you feel extraordinary in every gathering or occasion you go.

Valuable Gemstone Beads :

A valuable gemstone is only a nature's finest creation normally utilized for gems. Valuable gemstone beads incorporate ruby rondelle gemstone beads, sapphire gemstone dots, emerald gemstone beads and numerous different valuable mixed ranges for your delightful formation of gems. 

Valuable beads

Valuable gemstone beads are accessible in diverse sizes, shapes, brightness and clarity. During processing of the gemstones, they are colored, stained and wrapped up by the specialist.

Briolette :

Briolette gemstone beads are drop molded gemstone beads secured with various aspects that corners to a pointed end. Briolette gemstone beads are accessible in diverse mixed range like ametrine beads, garnet beads, rutile pear faceted dab, carnelian pear faceted beads, sea green/blue faceted beads, tourmaline beads, pedriot beads and different assortments of briolette. This briolette is generally utilized within designing obsolescent Victorian gems furthermore in the royal stones.

Most effective method to pick gemstone beads :

There are distinctive sorts of gemstone beads which you can use as per your choice. There are different shades of these beads and each one color has diverse sort of beads. For instance, the yellow gemstone beads have three primary sorts of diamonds, yellow topaz citrine, and precious stone separately. Red gemstones are ruby, garnet, spinet and coral. 

Gemstone colours chart for colour choose

The pink gemstones are Tourmaline and sapphire. Green gemstones are jade, peridot and emerald, green sapphire. Lolite, tanzanite, chalcedony, lapiz lazuli, amethyst and sea green/blue are parts of the blue and violet gemstone beads. In tans and grey hairs you can discover precious stones and smoky quartz. White gemstone dots are opal, precious stones and quartz. There are several precious stones which are dark in shade also. An alternate kind of gemstone beads which are dark in color are known as onyx.

Advantages of Gemstone beads :

Gemstone beads make adornments uncommon and remarkable. Separated from being eye-finding, they are enduring as well. Wearing gemstone beads is viewed as a carrier of good fortunes. This is focused around the Vedic conviction that partners gemstone beads with prophetic signs led by nine planets.

Gemstones are additionally worn to recuperate diseases. It is accepted since old times that wearing gemstones can have positive consequences for one's wellbeing. The reason given is that the light enters these translucent gemstones and progressions its wavelength. At the point when diverse wavelengths of light interface with skin and blood, they have distinctive wellbeing impacts on the wearer of this gemstone beads adornments.

 

Posted on Monday, August 11, 2014 - 12:47

Gemstones,Minerals and Colors

Beauty, bedazzlement and absolute exquisiteness are the words that come to your mind when one thinks of gems. There is absolutely no woman who does not adore them and even has a favorite one. In fact gems have also been very popular with men from quite a long time. A gemstone is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.But  certain rocks (such as lapis lazuli) or organic materials that are not minerals like amber or jet  are also used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value. What makes a gem stone really precious is its rarity. Besides jewelry antiquity engraved gems and hard stone carvings, such as cups, were major luxury and high level art forms.With the latest trends and designs for both men and women jewelry gems are very popular with the genders. The year 2014, like its predecessors has a high demand of gems but certainly offers exclusive variety and trends.

Gems are nature’s precious gifts to mankind and they most definitely make for a fabulous gift for your loved ones. This year make your loved ones feel even more special by giving them the trendiest gem stones. Fashion and trends are influenced by a lot of factors but most certainly seasons play a very crucial role.

Color of the year -

Every year a color gets chosen by the fashion experts and it finds its way in to clothes, jewelry and other fashion accessories. This year the color you cannot afford to miss in your gem stone collection is the ravishing radiant orchid. Yes, it really is as pretty as it sounds, if not more! It is an amalgamation of fuchsia, purple and pink undertones. Purple tones are quite popular for clothing’s as well for the year 2014.For your gem stone jewelry,make sure you add purple Sapphire and Amethyst to your year’s collection. The color palates of these two are sure to make you a fashionista this year.Purple Tourmaline, Purple Spinel, and Purple Chalcedony: Combines pink and purple hues, which make it very close to the beautiful radiant orchid. While you experiment with gems of this shade, you will definitely come across the Kunzite, in shades varying from pink to lilac, when you add this beauty to your accessories make sure you store them well to avoid fading of color of any sort.

While this year’s trend sure to make you a head turner, you don’t have to be disappointed with the gem stones you collected last as per last year’s trend. The green emerald will continue to be a popular heart throb this year as well. While it is a color that goes perfectly with every shade, try it with red and you will be a head turner.

 Pink Tourmaline

Spring gem trends

2014 welcomed the year with classic, chic trends and colors in gems. The colors were subtle but the statement pieces were bold. Be it on the ramp or in the elite boutiques and jewelry stores across the world, pearls and a spring palate of colored gems ruled the season. The patterns in which these gem stones were embodied were all to make a statement. The gem trend saw a lot of contrast mixes, either a combination of multi colored gems with pastel clothes or the colors and brightness of the clothes was complimented with neutral shade stones.Like nature welcomes the year with different blossoming flowers,the world of fashion got a beautiful start with a varied use of gem stones and the floral link pattern necklaces, bracelets and earrings with a gem stone in between became a rage. To adorn all this jewelry in a classic yet subtle way, the aquamarine gemstone,serpentine, peridot, and the beautiful green variscite were used graciously. Continuing the trend of subtlety and elegance were the smoky quartz, graymoonstone and the champagne diamond. As for the brighter use of colors, the season of spring saw the popularity of Lapis lazuli and tanzanite, chalcedony,iolite and coral, garnet and ruby, sunstone or fire opal. All these added a spark to the otherwise subtle clothing trends recommended with these by the fashion gurus. Animal motifs and word play also became very popular in gem stone jewelry.

                                   necklace



















Gems trends that follow

You can experiment and choose either the brighter stones or the subtle ones to create your own statement neckpieces but while you do so, remember that gold, silver and copper metals are what you need to combine your lovely gem stones with. From floral link patterns to simple Pandora beads, gem stones are bound to be the thing to go to for fashion brownie points. The radiant orchid shade is something g that will defiantly keep you in vogue this year and to make sure you are a part of the chic crowd you can experiment with stones like alexandrite, kunzite and amethyst.

The years must have

Opal, yes the grand and beautiful opal is a must have, from celebrities flaunting it on the red carpet to its presence in fashion magazines ,opal has made it in to the top names of this year’s gem trends. It is one gem stone that gives you so much variety, the reflective colors make it a winner with everything and anything you want to team it up with. The sheer radiance and awe inspiring color display make it look and expensive and exquisite, now I know I speak for every woman when I say that is exactly how the jewels they wear should look like.

opal

Special gems for special occasions

For people getting snitched this year a shade of the radiant orchid must for thetrousseau, it will certainly look exquisite with a white gown.But for the ones who want to opt for something more traditional and time less, they can try mixing up crystal beads, corals and a big broach. So for all those who design beautiful neckpieces, this idea will  go a long way .This look can be flaunted very well in parties and other special occasions as well. It should be tried to become one of the trendiest people of 2014, a person who certainly knows their way around gems!

You can also refer to the following links for more information on the gem stone trends of 2014.

 

Posted on Saturday, August 9, 2014 - 11:16

“How to separate Synthetic and Natural Spinels”?

Natural Spinels: Originally, Spinels and Rubies were considered as the same stone because Natural Spinels were found on the same locations as Corundum. The red color species of Spinel were misidentified as Ruby and other colors of Spinels were as Sapphires. Even for the centuries, the magnificent red gemstone of 5.08 centimeter popularly known as “Black Prince Ruby” at the center of British Imperial Crown was thought to be Ruby only but studies has recently  shown that the stone is Spinel actually.    

Crown

British Imperial Crown ,Picture Courtesy- Wiki Pictures

The most fascinating features of Spinels are:

  • They are singly refractive. Gemstones other than Diamonds, Spinels and Garnets are double-refractive.
  • There is a complete absence of cleavage.
  • They formed as a cubic crystal like a Diamond.

Spinel- Gemological Properties

Chemical composition

Mg(Al2O4) Magnesium aluminum oxide

Crystal system

Cubic

Habit

Octahedral, contact twins

Cleavage

Imperfect

Fracture

Conchoidal, uneven

Hardness

8

Optic nature

Isotropic

Refractive index

1.712 - 1.736

Birefringence

None

Dispersion

0.026

Specific gravity

3.58 - 3.61

Lustre

Vitreous

Pleochroism

None

The most significant deposits of Spinels occurred in Myanmar (Burma), Sri-Lanka (Ceylon), Cambodia, Thailand, Brazil, Madagascar, Nepal, Tanzania, Tadzhikistan, Afghanistan and Australia. Spinels comes in variety of colors which ranges from blue, red, green, yellow, brown, black, orange, pink to violet. But the rarest Spinel is Cobalt Blue which has a rich deep blue color.

        

 Central Asia Corundum and Spinel Reserves, Picture Courtesy- Ruby Sapphire.com

Types of Spinels: Variety of names has been given to the different members of Spinel family. Some are:

  1. Balas Spinel: These are pale-red variety of Spinel is called Balas Spinel. In the past it was mistakenly known as Balas Rubies.
  2. Flame Spinel: These are bright orange and orange-red variety of Spinel. In the past it was known as Rubicelle.
  3. Hercynite Spinel: The color of Hercynite ranges from dark-green to black, due to the presence of iron content.
  4. Pleonaste Spinel: The color of Pleonaste is also dark-green to blackish opaque, but is little lighter than Hercynite. It is popularly known as Ceylonite.
  5. Gahnite Spinel: These are blue, violet and dark-green to black variety of Spinel. Sometimes also known as Zinc Spinel.
  6. Gahno Spinel: The color of this variety is similar to Gahnite but less dense colors are found.
  7. Picotite Spinel: These are yellowish brown, dark-green to black variety of Spinel. Sometimes known as Chrome Spinel.

                                     

    A variety of Spinels

Synthetic Spinels: Spinels can be synthesized by using three methods:-

  1. Verneuil (flame-fusion) method
  2. The flux-melt method
  3. Czochralski (pulling) method.

The Flame-Fusion Method: This method of producing Synthetic Spinels occurs accidently while producing synthetic Corundum in 1908. A Natural Spinel has the ratio of MgO to Al2O3 is 1:1. Verneuil Synthetics are produced by changing the ratio to 2:1 (doubling the amount of alumina). Increased amount of alumina resulted into increased Refractive Index (1.727) and Specific Gravity (3.64).

Properties of Flame Fusion Synthetic Spinel

Color

Coloring agent(s)

RI

SG

Other diagnostic tests

Colorless

none

1.728–1.740

3.65–3.80

LW UV: green; SW UV: white/blue

Red

Cr3+

1.722–1.725*

3.58–3.60

curved striae; spectrum; fluorescence

Pink

Cu

1.727–1.740

3.65–3.80

 

Yellow

Mn

do.

do.

LW/SW UV: green

Emerald green

Mn + Co3+

do.

do.

 

Tourmaline green

Cr3+

do.

do.

spectrum

Beryl green

Cr3+ + Mn

do.

do.

spectrum

Zircon blue

Co3+ + Cr3+ + Ti

do.

do.

spectrum

Sapphire blue

Co3+

do.

do.

spectrum; fluorescence; CCF

Amethyst violet

Co3+ + Mn

do.

do.

 

Alexandrite color change

Cr3+ + V

do.

do.

spectrum

Lapis lazuli imitation

Co3+

1.725

3.52

spectrum; CCF

 

 Diagram showing how Synthetic Spinels are produced under Verneuil Method.

The Flux-Melt Method: It was observed that by Flame-Fusion method red spinels of larger quantity cannot be produced. To produce, bigger red even the blue Spinels the Flux-Melt method is used. The synthetics produced by this method are true synthetics as they are produced by 1:1 ratio of alumina and magnesium.

Properties of Flux-Melt Synthetic Spinel

Color

Coloring agent(s)

RI

SG

Other diagnostic tests

Red

Cr3+

1.716-1.719

3.58-3.62

LW/SWUV: distinct red-orange/red
residual flux inclusions

Blue

Co2+ + Fe2+

1.719

3.58

Spectrum; SWUV: inert; LWUV: Weak red
residual flux inclusions

                           synthetic Spinels       

                     Picture Courtesy-GIA

The Czochralski (pulling) Method: This method is a recent development (2007). The production of red to pink Synthetic Spinels is done by Czochralski (pulling) method.

Difference between Natural and Synthetic Spinels:-

Rough Spinels

Picture Courtesy-GIA

1. Microscopic Evidence:  Synthetic Spinels has flux or some growth viewed under careful microscopic observations while Natural Spinels has lot of natural inclusions or at least some when viewed under microscope. Following pictures would explain this concept more clearly. 

RED Spinels

Rough Spinels

    Picture Courtesy- GIA

2. Magnetic Properties: The Natural and Synthetic Spinels can be separated on the basis of their different magnetic properties. A Natural Spinel has iron content hence; they show weak to moderate response to magnets. While, Synthetic Spinels has no iron content in them as a result, they do not any response to magnets. Some light colored and orange color of Natural Spinels is colored due to chromium, which causes it to be repelled by a magnet.

3. Refractive Index and Specific Gravity:  The Natural Spinel has a Refractive Index of 1.72, in case of Red Spinel it is 1.74 and in Zinc rich Spinel it can be1.805 (rare to be found). Synthetic Spinels has a noticeably different R.I. of 1.727-+0.001. The specific gravity of Natural Spinels has S.G. ranges 3.58-3.61, Zinc rich Spinels has S.G. as high as of 4.40. Synthetic Spinels has S.G. ranges between 3.63- 3.64.

4. Fluorescence under UV rays: A Natural Spinel has a strongest fluorescence under long wavelength and weak to absent under short wavelength. While, Synthetic Spinels has strong fluorescence under short wavelength and may often a bright blue, chalky green or red fluorescence.

Synthetic Spinel showing a neon red color under short UV rays. Picture Courtesy- Ruby Sapphire.com

5. Price: There is a big difference in between the price of Natural and Synthetic Spinels. A Natural Red Spinels range starts from 100$/carat and goes till 5, ooo$/carat. Price varies from color to color; red is the costliest, followed by blue, then pink and in last multi-colors.  Synthetic Spinels are very cheap. They are easily available in the market at a price of 1$/carat-2$per carat.

6. Synthetic dark Red Spinel is apparently not manufactured in the quantities than most of the colors. Most dark synthetic red stone are corundum.

Conclusion:

 

S.No.

 

         Basis

 

Natural Spinels

 

Synthetic Spinels

1.

Price

100$/carat-5000$/carat

1$/carat-2$/carat


2.

Natural Inclusions

 

Yes

No,  growth signs can be seen

3.

Strongest         Fluorescence

 

Under long wavelength

Under short wavelength

4.

Refractive Index

 

1.72


5.

Specific Gravity

 

3.58-3.61

3.63-3.64

6.

Response to Magnet

Yes

No

7.

Ratio of Al:Mg

 

1:1

2:1 under flame fusion method

Posted on Thursday, August 7, 2014 - 11:58

Does Paraiba Tourmaline only comes in “Blue-Green Neon” color or can it come in “Violet Tanzanite” color also?


Does Paraiba Tourmaline only comes in “Blue-Green Neon” color or can it come in “Violet Tanzanite” color also?
Today we are talking about the Paraiba Tourmalines which are one of the rarest gemstones ever discovered on the Mother Earth. These splendid gemstones are the great combination of rarity and unique beauty.
History behind Paraiba Tourmalines
Tourmalines can be found in almost every shade of the rainbow but none of the colors can beat up the vivid glow of Paraiba Tourmaline from Brazil. These magnificent stones were first discovered near a village Sao Jose da Batalha, Paraiba- A Brazilian State in the year 1989.
                       
A map showing Paraiba State of Brazil where beautiful Paraiban Tourmalines were first found. Picture Courtesy- Wiki Pictures.   
Heitor Dimas Barbosa and his team began excavations in the year 1981 and it took them five and half years to find the galleries, tunnels and shafts that distinguish areas laden with gemstones. It took several more years to find Tourmalines in shades and hues that World has never seen before. The man behind these sparkling stones Barbosa was recovering from illness when these first handfuls of gems were brought to daylight. Thus, Paraiba Tourmaline is a recent discovery and a pop sensation of the Tourmaline family.
                                      
Discoverer of Paraiba Tourmalines- Heitor Dimas Barbosa. Picture Courtesy- Rocks & Co.
A look to the Tourmaline Family
The word Tourmaline has been derived from Sinhalese word “turmali” which in English means “stone with mix colors or mixed parcel”. Similar to Garnet, Tourmaline is also not made up of a single mineral but it is formed by a group of closely related silicate minerals. It is classified as a semi-precious gemstone with a wide variety of colors. The Tourmaline mineral group is chemically the most complicated groups of silicate minerals. This gem is 7-7.5 on the Mohs Scale of Hardness.
              
Examples of colors in Tourmaline Family
Copper makes Paraiba different
Gemstone Tourmaline comes in almost every color of the Rainbow. Brazil has classical reserves of Tourmalines. Generally iron, manganese, chrome and vanadium elements are responsible for the various coloring of Tourmalines. But Paraibas are different. Gemologists found that reason behind the vivid color of Paraiba Tourmalines is due to presence of copper in it. Later, it was found that these gems contain some amount of manganese also. 
                          
Vivid colored sparkling Paraiba Tourmalines. Picture Courtesy-GIA
The interaction between iron and manganese give rises to the beautiful range of colors like greenish-blue, bluish-green, emerald green, sapphire blue, bluish-violet and purple. The new lustrous colors were often narrated as “Neon” since they appeared to glow.
Higher proportion of cooper is responsible for the colors like blue, turquoise and green hues. Apparently, presence of manganese causes violet and red tones. To eliminate any red hues Heat Treatments are given to Paraiba Tourmaline which brighten up the sparkling color even more.
Colors of Paraiba Tourmalines
1. Bluish-green color: The blue color of Tourmaline occurred due to the presence of copper into it. Color intensities ranges from pale blue to dark blue. The presence of manganese can modify the blue color into bluish-green color which can lead to pink or red zoining. 
                         
A Bluish-green colored Paraiba Tourmaline. Picture Courtesy - Awesome Gems.
   
2. Blue color: This color is also known as Tanzanite Blue. These deep dark blue Tourmalines exactly look like to color of Tanzanite.
                               
A 3.28 carat blue colored Paraiba Tourmaline. Picture Courtesy- GIA
3. Violet and Purple color: The pink color of manganese and blue color of copper resulted into violet and purple. Manganese presence in high concentration in turns violet and purple colored Paraiba Tourmalines.
              
Purple and Violet colored Paraiba Tourmalines. Picture Courtesy- Gemstone Magnetism
4. Green color: Green Paraiba Tourmalines has high concentration of manganese then copper. Green color may be due to combination of yellow from manganese and blue color from copper.
                                
A green colored Paraiba Tourmaline. Picture Courtesy- Gemologyonline.com
5. Red and Pink color: The pink and red colored Tourmalines are not classified as Paraibas as they contain only slight amount of copper as compared to green and blue Paraibas. Any significant copper concentration would shift red and pink Tourmaline towards violet and purple colored Paraibas.
                           
These are pink-red and pink Tourmalines.  Picture Courtesy- Gemstone Magnetism
Controversy with Paraiba Gems
It is rightly said by someone “with the great name controversies come along”. This happens with Paraiba Tourmalines also. In the year 2001, the sparkling blue-green Tourmalines from Nigeria (Africa) hit the gemstone market. These were look like the ones which had till now comes only from Paraiba. There was a slight difference in color saturation which can be hardly noticeable by layman. 
                                        
Similar colored Tourmalines from Nigeria. Picture Courtesy- GIA
Another twist to the story comes in the year 2005 when variety of colors as Brazilian Paraibas was found in Mozambique. The color of Mozambique was much similar to Brazilian Paraibas. Even, Mozambique ones are cleaner and found in bigger sizes than the Brazilian ones.
                      
These are tourmalines found in Mozambique. Picture Courtesy- GIA
Attributes of Paraiban Tourmalines:
1. Rarity:  One Paraiba Tourmaline is mined for every 10,000 diamond. Moreover, depletion of fine-quality reserves in Brazil makes these gems super rare.
2. Sky-high prices: Rarity directly influences the prices of Paraiba Tourmalines. Brazilian Paraibas cannot be founded in larger sizes. The fine quality stones under 2carat can range from 3500$to 15000$ per carat. The rare stone above 2 carat can yield prices upto 18000$ per carat or even more.
3. Fewer Locations: The stone is only known to exist in three locations on Earth.
4. Brilliance of the gem: These gemstones are extremely brilliant and sparkling in their unique colors even under the poor light conditions.
Conclusion:
The answer to the question raised in the title of the article is “Yes”. Paraiba Tourmalines can be found in violet tanzanite color also. As explained under the heading “Colors of Paraiba Tourmalines”. After the discovery of African and Mozambique Tourmalines, a long series of debate held between the industry experts whether stones from Africa and Mozambique should fall in the same category as Brazilian Paraibas. As Paraiba is a name of the state of Brazil.
All these debate comes to end when GIA release a statement saying that- any gems with similar colors as those of Paraiba and presence of copper content in them will be referred as Paraiba Tourmaline irrespective of their place of origin. Now, copper-bearing Tourmalines from Brazil, Nigeria and Mozambique and any future copper –bearing deposits are referred to Paraiba Tourmalines.

Today we are talking about the Paraiba Tourmalines which are one of the rarest gemstones ever discovered on the Mother Earth. These splendid gemstones are the great combination of rarity and unique beauty.

History behind Paraiba Tourmalines

Tourmalines can be found in almost every shade of the rainbow but none of the colors can beat up the vivid glow of Paraiba Tourmaline from Brazil. These magnificent stones were first discovered near a village Sao Jose da Batalha, Paraiba- A Brazilian State in the year 1989.

                       

A map showing Paraiba State of Brazil where beautiful Paraiban Tourmalines were first found. Picture Courtesy- Wiki Pictures.   

Heitor Dimas Barbosa and his team began excavations in the year 1981 and it took them five and half years to find the galleries, tunnels and shafts that distinguish areas laden with gemstones. It took several more years to find Tourmalines in shades and hues that World has never seen before. The man behind these sparkling stones Barbosa was recovering from illness when these first handfuls of gems were brought to daylight. Thus, Paraiba Tourmaline is a recent discovery and a pop sensation of the Tourmaline family.

Discoverer of Paraiba Tourmalines- Heitor Dimas Barbosa. Picture Courtesy- Rocks & Co.

A look to the Tourmaline Family

The word Tourmaline has been derived from Sinhalese word “turmali” which in English means “stone with mix colors or mixed parcel”. Similar to Garnet, Tourmaline is also not made up of a single mineral but it is formed by a group of closely related silicate minerals. It is classified as a semi-precious gemstone with a wide variety of colors. The Tourmaline mineral group is chemically the most complicated groups of silicate minerals. This gem is 7-7.5 on the Mohs Scale of Hardness.              

Examples of colors in Tourmaline Family

Tourmaline

Copper makes Paraiba different

Gemstone Tourmaline comes in almost every color of the Rainbow. Brazil has classical reserves of Tourmalines. Generally iron, manganese, chrome and vanadium elements are responsible for the various coloring of Tourmalines. But Paraibas are different. Gemologists found that reason behind the vivid color of Paraiba Tourmalines is due to presence of copper in it. Later, it was found that these gems contain some amount of manganese also. 

                          

Vivid colored sparkling Paraiba Tourmalines. Picture Courtesy-GIA

The interaction between iron and manganese give rises to the beautiful range of colors like greenish-blue, bluish-green, emerald green, sapphire blue, bluish-violet and purple. The new lustrous colors were often narrated as “Neon” since they appeared to glow.

Higher proportion of cooper is responsible for the colors like blue, turquoise and green hues. Apparently, presence of manganese causes violet and red tones. To eliminate any red hues Heat Treatments are given to Paraiba Tourmaline which brighten up the sparkling color even more.

Colors of Paraiba Tourmalines

1. Bluish-green color: The blue color of Tourmaline occurred due to the presence of copper into it. Color intensities ranges from pale blue to dark blue. The presence of manganese can modify the blue color into bluish-green color which can lead to pink or red zoining. 

                         

Paraiba Tourmaline

A Bluish-green colored Paraiba Tourmaline. Picture Courtesy - Awesome Gems.  

2. Blue color: This color is also known as Tanzanite Blue. These deep dark blue Tourmalines exactly look like to color of Tanzanite.

 Blue Paraiba Tourmaline

A 3.28 carat blue colored Paraiba Tourmaline. Picture Courtesy- GIA

3. Violet and Purple color: The pink color of manganese and blue color of copper resulted into violet and purple. Manganese presence in high concentration in turns violet and purple colored Paraiba Tourmalines.

              

Purple and Violet colored Paraiba Tourmalines. Picture Courtesy- Gemstone Magnetism

4. Green color: Green Paraiba Tourmalines has high concentration of manganese then copper. Green color may be due to combination of yellow from manganese and blue color from copper.                     

Green Paraiba Tourmaline

A green colored Paraiba Tourmaline. Picture Courtesy- Gemologyonline.com

5. Red and Pink color: The pink and red colored Tourmalines are not classified as Paraibas as they contain only slight amount of copper as compared to green and blue Paraibas. Any significant copper concentration would shift red and pink Tourmaline towards violet and purple colored Paraibas.

                           

These are pink-red and pink Tourmalines.  Picture Courtesy- Gemstone Magnetism

Controversy with Paraiba Gems

It is rightly said by someone “with the great name controversies come along”. This happens with Paraiba Tourmalines also. In the year 2001, the sparkling blue-green Tourmalines from Nigeria (Africa) hit the gemstone market. These were look like the ones which had till now comes only from Paraiba. There was a slight difference in color saturation which can be hardly noticeable by layman.                                  

Similar colored Tourmalines from Nigeria. Picture Courtesy- GIA

Another twist to the story comes in the year 2005 when variety of colors as Brazilian Paraibas was found in Mozambique. The color of Mozambique was much similar to Brazilian Paraibas. Even, Mozambique ones are cleaner and found in bigger sizes than the Brazilian ones.               

These are tourmalines found in Mozambique. Picture Courtesy- GIA

Attributes of Paraiban Tourmalines:

1. Rarity:  One Paraiba Tourmaline is mined for every 10,000 diamond. Moreover, depletion of fine-quality reserves in Brazil makes these gems super rare.

2. Sky-high prices: Rarity directly influences the prices of Paraiba Tourmalines. Brazilian Paraibas cannot be founded in larger sizes. The fine quality stones under 2carat can range from 3500$to 15000$ per carat. The rare stone above 2 carat can yield prices upto 18000$ per carat or even more.

3. Fewer Locations: The stone is only known to exist in three locations on Earth.

4. Brilliance of the gem: These gemstones are extremely brilliant and sparkling in their unique colors even under the poor light conditions.

Conclusion:

The answer to the question raised in the title of the article is “Yes”. Paraiba Tourmalines can be found in violet tanzanite color also. As explained under the heading “Colors of Paraiba Tourmalines”. After the discovery of African and Mozambique Tourmalines, a long series of debate held between the industry experts whether stones from Africa and Mozambique should fall in the same category as Brazilian Paraibas. As Paraiba is a name of the state of Brazil.

All these debate comes to end when GIA release a statement saying that- any gems with similar colors as those of Paraiba and presence of copper content in them will be referred as Paraiba Tourmaline irrespective of their place of origin. Now, copper-bearing Tourmalines from Brazil, Nigeria and Mozambique and any future copper –bearing deposits are referred to Paraiba Tourmalines.


 

Posted on Thursday, August 7, 2014 - 11:01

Why are glass filled Rubies so high in trend?

Gem Ruby has been the main stray of the jewellery industry for centuries. It has been always the first love of gemologists, gem dealers, collectors and the customers. From the ancient times, Rubies are gems of the wealthy people. The demand for the Rubies has usually much higher than its supply. The main reason for the shortage in supply of Rubies is the depletion of corundum reserves of Thailand, Cambodia and Mogok in Burma. This leads to shoot up of the prices of Ruby much above the expectations of any one.

To be able to deal with the problem of high prices of Ruby, a group of gemstone experts and scientists came up with idea of producing Synthetic Ruby. In the past, Synthetic Rubies were considered as low cost Ruby. These Synthetic Rubies are real Rubies (as they are made up of aluminum oxide). But, they are created in the laboratory under the process known as “Flame-fusion”. The Rubies produced under this method are attractive and has very low value in the market.

In November 2004, the Gemstone Industry witnesses a large number of Rubies having some uncommon features entering into the market. After the detailed investigation of these gemstones by the recognized laboratories like Asian Institute of Gemological Sciences Gem Test Laboratory (AIGS) and Gemological Institute of America (GIA) they concluded that Rubies are Glass filled Rubies.         

Ruby Mozambique Rough before and after the glass-filling treatment. Picture Courtesy- GIA

 Treatments for enhancement of Rubies: There can be two types of treatment given to Rubies for the enhancement.

 1.Conventional Heat Treatment: Heat treatment can improve the color and blemishes of the stone. This treatment is commonly used for the lower quality of Ruby rough stones to remove purple tingle, blue patches and silk. Generally, this treatment occurs around the temperature of 1800 degree Celsius (3300 degree Fahrenheit). Besides this, some Rubies undergo a process of low tube heat, in which stone is heated over charcoal for the temperature of about 1300 degree Celsius (2400 degree Fahrenheit) for 20 to 30 minutes.

2.Lead Glass filling Treatment: Lead glass filling is a treatment given to the low qualities of Rubies. It is a process under which fractures inside the Ruby are filled with lead glass (or a similar material) at considerable temperature which dramatically increases the transparency and color of the stone. The refractive index of Rubies and lead glass is almost same which allows light to pass through the gem as a result color and clarity improves.

Glass filling treatment for Rubies was discovered at Gem laboratory in Chantapuri, Thailand under the expert Mr. Mahiton Thondisuk.

Man on extreme right id the founder of Glass-filled Rubies Mr. Mahiton Thondisuk. Picture Courtesy- AIGS

Process of Glass Filling:Lead glass filling is a multi-step treatment which involves simple heat treatments and then use of different lead rich compounds to fill the fissures and cavities of the stone.

Step 1: The stones are pre-polished to eradicate all the impurities that could disturb the treatment. The rough is cleaned by hydrogen fluoride.

   Rough Rubies before cleaned by hydrogen fluoride


     Rough Rubies after cleaned by hydrogen fluoride

Step 2:The second step is a “warming” step. At this step, heat treatment is given to the stones to remove the impurities inside the fissures which could disturb the treatment when the glass is added. The heat temperature can be given from 900 degree Celsius to 1400 degree Celsius. But, generally treatment is done around the temperature of 900 degree Celsius. It is believed by AIGS (Asian Institute of Gemological Sciences) that at 900 degree Celsius the rutile inclusions within the stone will not melt and as a result stones will have that aspect of “unheated” stones maintained in them.

Under 2nd step cleaned Rubies are undergoing a heat treatment

Step 3:The third step includes heat treatments of the stone with some oxide powders. The composition of these oxide powders may consists a mixture of  lead, silica, sodium , potassium, calcium and metallic oxides like vanadium and bismuth are also added in some glass compositions. There are two main types of glass compositions used in the process.

First type:The first type of composition is a basic formula which is a simple lead rich transparent glass. This formula is usually used for most of the best quality larger stones. The orange powder will turn into a yellowish to orange glass after heating.


Rubies covered by yellowish lead glass after treatment

Second type: The second type of composition includes some other metallic oxides in order to produce the glass, optimizing the color and other aspects of Rubies. This formula is famous by the name “Popular Formula” and it is used on “iron stain” rich commercial quality stones. This formula is a mixture of many oxides which results into pink color. Under, this formula heat treatment temperature is slightly higher around 1000 degree Celsius.

  Rubies covered by transparent glass after treatment

The rubies are dipped with oils, then covered with the powders and embedded in the electric oven at the temperature of 900 degree Celsius for one hour in an oxidizing atmosphere. The powder will fuse during the heating process and turns into the glass.

This third step of heat treatment can be performed repeatedly three to four times with different metallic oxides in order to get desired and better colors. Then, the stones are finally cut and polished.

    Final product of Glass-filled Rubies after cutting and polishing

Difference between Glass-filled, Heat-treated and Unheated Rubies:

1. Prices of the Ruby gems with glass filled treatment are comparatively low to those who are heated with the conventional heat treatment method. Unheated Rubies are those which are not heated at all command very high prices.

2. There is a lot of difference in the inclusions of these three types of Rubies. The difference will be explained by the following pictures:

                                                                                    Non-heated Ruby

When there is intact intersecting needle rutile inclusions known as Silk is present it is proved to be non-treated Ruby. Picture Courtesy-GIA

    Glass-filled Ruby

Repaired cavities of Glass-filled Ruby are clearly visible in reflected light. 

3. Glass filling of fractured Rubies is a new concept while conventional heat treatments have been given to Rubies from the centuries.

4. The intensity of heat treatment is high in conventional heat treatment as compared to glass-filled method.

Disclosure of the Treatments: All ethical sellers should disclose any treatment given to the gemstones at the time of selling it to customers. As per AIGS (Asian Institute of Gemological Sciences) opinion “as long as the customer is provided with the correct information of the stone and price charged to him is related to the real quality of the stone there is nothing wrong about the treatments”.

In fact, the dealer should provide the difference between Natural Ruby and Glass-filled Ruby to the customer. He must be acknowledged about the splendid qualities of Natural Ruby at the time of purchase.

Trend of Glass-filled Rubies: Following are the features of Glass-filled Rubies which increases its demand in the market:-

  1. High prices of Natural Ruby: Glass-filled Rubies are very reasonably priced. They are less than 2% of the price of the Natural Rubies. Glass-filled are easily available in the market at a price of 2$-10$ per carat. While, Natural Rubies with average quality ranges between 200$-500$ per carat.
  2. Good Color: The color of Glass-filled Rubies is also fine because its fractures and cavities are filled up by lead and other metallic oxides. These repairs give Glass-field Rubies a good transparency and also a good color.                    

Image showing the pleasant color of glass-filled Rubies. Picture Courtesy- Pala Gems

3. Satisfaction to the customer:Glass- filled Rubies gives satisfaction to the customer. For example: if a customer buy wants to buy a Natural Ruby costing him 100,000$ but cannot afford it then he can switch to Glass-filled Ruby costing him around 100$. Customer can buy glass-filled Rubies and feel that at least there is some content of Ruby in these Glass-filled ones at much cheaper prices.

4. Appropriate for mass production: Glass-filled Rubies can be mass produced for the bulk orders. It is very easy to produce same color, same size of Rubies in case of glass-filled ones. At the same time, it is impossible to make Natural Rubies in perfect calibrated sizes and shapes.

5. Change in fashion: Bold statement pieces of jewelry is the trend of   today and red is the color which would always be in demand. The prices of large size natural Rubies are sky-high so customers are shifting towards glass-filled Rubies which are available at much reasonable prices.

6. Easy to trade: Glass filled ruby are profitable also. Thatswhy, everyone is buying and selling this stone. It is very easy to sell it to any customer who wants to buy Ruby. Most of the dealers buy these to make sure that if a customer comes in their store looking for Natural Ruby but does not want to spend 20,000$ on a 10 carat stone then they would usually return back and walk of their store. But if they have glass-filled ruby then they can sell it for 2000$ and make good profit and convince the buyer that this is still Ruby just that it has glass content filled by humans in it.

GIA Report on Glass-filled Ruby

Videos of Glass-filling



Posted on Wednesday, August 6, 2014 - 18:00