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Crystal in Gem Chrysocolla
Given the consistency of hue, saturation, and tone, it is the degree of transparency that defines the various grades of gem chrysocolla. This gem is never completely transparent; it is translucent. It is the degree of translucency that is the defining factor. The greater the translucency the more the gem will be seen to glow in the light. It can be said that crystal is really the first C of connoisseurship in gem chrysocolla, as well as in the other agate varieties to be discussed in this section. Visually pure blues with a high degree of translucency is more desirable than an opaque pure blue.
Gem chrysocolla is often cut in freeform (nonsymmetrical) shapes. Shape has little effect on value except that the more interesting freeforms may command a premium. Particularly translucent gems will some-times be faceted.
Writting Original articles by Navneet Gems and Minerals, the source of Wholesale Gem Chrysocolla, and other Chalcedony Gemstones, and Semiprecious and Precious Gemstones.Posted on Tuesday, November 8, 2011 - 11:22
It is estimated that over eighty percent of gem chrysocolla is subject to a degree of color fading when exposed to a dry environment. This is particularly true of the Mexican material. As the stone dries out, the translucency and the color saturation of the gem are both diminished. According to Chris Boyd, a dealer who spends summers in upstate New York and winters in Arizona, and who has worked with gem chrysocolla for many years, fading is an issue in areas with an average relative humidity below fifty-five percent. His stone looks much better in New York than in the Arizona desert. Fading can be reversed when the gem is rehydrated by directly exposing it to moisture or to a moist environment for a short period of time.
Writting Original articles by Navneet Gems and Minerals, the source of Wholesale Non-color fading and fading Chrysocolla, both.Posted on Monday, November 7, 2011 - 13:03
Vividness of hue is the quality that assures gem chrysocolla a place among the precious gemstone. The hue varies from a slightly greenish medium dark-toned (fifty to seventy percent) turquoise blue to a similarly toned visually pure sky blue. The green secondary hue rarely exceeds ten percent. As with all blue gems, the smaller the percentage of secondary green, the more desirable the gem. Gem chrysocolla rarely shows any evidence of either a gray or brown mask. Thus, it has a consistently vivid hue. The tonal range of gem chrysocolla is also remarkably consistent.
Writting Original articles by Navneet Gems and Minerals, the source of Semi-Precious and Precious Gemstones from Bangkok, including Wholesale Chrysocolla.Posted on Monday, November 7, 2011 - 12:24
The rare rich sky-blue variety of chalcedony has been referred to variously as silicated chrysocolla, gem silica, agated-chrysocolla, and gem chrysocolla. The issue lies with the term chrysocolla. True chrysocolla is a soft, noncrystalline mineral that owes its vivid color, ranging from turquoise to sky blue, to the staining effect of copper oxides. Gem chrysocolla, by contrast, is a relatively hard cryptocrystalline silicate that has been stained blue by the same copper oxides.
Given the vast difference in hardness, the aficionado should have little difficulty in separating the two materials by appearance alone. True chrysocolla is opaque, with subvitreous luster, and has a hardness of two to four on the mohs scale. Materials of this hardness normally can be scratched with a copper penny. Gem chrysocolla may be opaque to translucent and have a vitreous, or glassy, surface luster and, with a hardness of seven, it is harder than steel. Standard gemological tests can easily separate the two materials. True chrysocolla may have all the beauty of gem chrysocolla, except the luster, but it lacks the requisite hardness and durability necessary to qualify it as a gemstone.
Much of the finest gem chrysocolla is found in the copper mines of Pinel County, Arizona. In the 1960s a deposit of the gem was found on the island of Taiwan. In the East, gem chrysocolla is sometimes referred to as “blue jade,” an unfortunate term that further adds to the linguistic confusion.
Writting Original articles by Navneet Gems and Minerals, the source of Wholesale Gem Chrysocolla, and many more Chalcedony.Posted on Monday, November 7, 2011 - 12:15
Since at least 2000BC, Chalcedony has been subjected to heat treatment to create carnelian. Heat treated agates were among the treasures unearthed from the tomb of King Tutankhamen (1300BC). Most of the carnelian currently on the market has been heat treated. Agate is quite porous and can be soaked in acid to create a dark outer layer in preparation for carving en cameo. Porosity also makes chalcedony a good candidate for dyeing. Dyeing will sometimes produce a very highly saturated unnatural-looking hue. For example, “green onyx” is colorless chalcedony that has been dyed rich dark green; it looks simply too green to be true and it is! Black onyx is also universally dyed. The blue varieties of chalcedony are also subject to dyeing. Under magnification, natural color agate will usually show evidence of thin color bands. Specialists call these bands fortifications of color. Heat treatment will burn out the bands. Acid treatment produces a dark, dense, “burnt” look in carnelian (Chalcedony). Many first-to third century Roman intaglios, engraved seal stones, fit this description perfectly. Because agates are relatively reasonable in cost, treatment are almost never disclosed to the buyer.
This section will consider the five most beautiful and commercially important varieties of chalcedony: gem chrysocolla, Holley blue and Mojave blue agate, carnelian, and chrysoprase.
Writting Original articles by Navneet Gems and Minerals, the source of Wholesale Loose Chalcedony, Green Ony and Black Onyx and many more.Posted on Monday, November 7, 2011 - 11:44
Even though most Chalcedonies have been ignored for most of the past century, several varieties of Chalcedony have become more and more popular over the last two decades. Chalcedony chrysocolla, Chalcedony Holley and Chalcedony Mojave, Chalcedony blue agate, Chalcedony carnelian, and chrysoprase are increasingly in demand for jewelry. There is a very good reason for this upward spike. New sources of these agates have produced gems of such surpassing beauty that they have simply become impossible to ignore. American and European lapidary artists have made extensive use of these materials in gem carvings. A few years ago Town & Country magazine featured an article on blue agate attesting to the fact that chalcedony is enjoying a new surge in popularity.
The best example of the first three types mentioned is found in the United States. The last two are found in Africa and Australia. All are from sources that have been discovered in the last twenty years. So fairly new sources for Chalcedony Gemstone, a semi precious stone.
Writting Original articles by Navneet Gems and Minerals, the source of Wholesale Chalcedony from Bangkok.Posted on Monday, November 7, 2011 - 11:32
Unlike crystalline quartz materials such as amethyst, which is a single crystal, this species of Chalcedony quartz is composed of tiny interlocking microscopic fibers. For this reason it is also called cryptocrystalline (hidden crystal) quartz.
Writting Original articles by Navneet Gems and Minerals, the source of Semi-Precious and Precious Gemstones from BangkokPosted on Monday, November 7, 2011 - 11:26
Quartz is earths most plentiful material, it is primary component of dust, making up twelve percent of earth’s crust, is quartz. It is surprising, therefore, that the finest examples of amethyst, the purple variety of quartz, are so rare and difficult fo find. Most quartz is very lowly priced, below 2$, but however Amethyst is one of the big exceptions, this Purple colored Gems, classified into Semi precious gemstones, is one of the very rare example in the history of Gemstone industry.
Amethyst can come in various colors, but most common is Purple Amethyst. Purple amethyst comes from two origins: African Amethyst, and Brazillian Amethyst. Amethyst from brazil has lesser sparkle but is available in large quantities in big sizes, however African amethyst is very rare to find above 50 carats. However, Navneet Gems and Minerals has a collection of these rare African amethyst which have immense value and potential to be made into gorgeous Silver or Gold Jewellery. Amethyst is also available in Green color, naturally mined from Brazil, but used not so commonly.
Writting Original articles by Navneet Gems and Minerals, the source of Semi-Precious and Precious Gemstones, specializing in Semi-precious Gems from Bangkok, straight from our factories in India and Thailand.Posted on Sunday, November 6, 2011 - 10:50
Amethyst occurs in a continuum of primary hues from a light-toned slightly pinkist violet to a deep concord grape purple of amethyst shade. Amethyst is expected to be eye-clean and given its relatively low cost, should always be finely cut for market standards of amethyst.
Amethyst may exhibit one or both of two possible secondary hues, red or blue. A light rosy red, what we think of as pink, is the usual secondary hue found in lighter-toned stones. The ideal tone for amethyst is between seventy five and eighty percent; at this tonal level the secondary hue, if there is one, will be blue. The color in amethyst may occur in overlapping zones of purple and blue. When the stone is viewed face up, the color will be a slightly (ten to fifteen percent) bluish purple. The blue adds a velvety richness to the purple hue.
Writting Original articles by Navneet Gems and Minerals, the source of Semi-Precious and Precious Gemstones, specializing in Semi-precious Gems from Bangkok, straight from our factories in India and Thailand.Posted on Sunday, November 6, 2011 - 10:39
In recent times the trend towards all things faceted has relegated chalcedony to the semi-precious backwaters. For most of the twentieth century, agates have been seen as a curiosity and not taken seriously as a gem material of rarity and value.
Thus far the terms chalcedony and agate have been used interchangeably. Chalcedony is the gemological terms used to describe a type of quartz with a micro or cryptocrystalline structure, as opposed to single crystal quartzes such as amethyst and citrine. Agate is a nontechnical term used as a common name for chalcedony, but is more often used to describe chalcedony gems with visible bands of color. However, jasper, carnelian, and sardonyx are varietal names also used to describe specific types of banded chalcedony. Here the term agate is used in the more universal sense as a common name for all varieties of chalcedony.
Writting Original articles by Navneet Gems and Minerals, the source of Semi-Precious and Precious Gemstones, specializing in Semi-precious Gems from Bangkok, straight from our factories in India and Thailand.Posted on Saturday, November 5, 2011 - 13:19