The Sparkle Of Chrome Green Tourmaline

Chrome is a special variety of green tourmaline that owes its vivid green hue to trace amounts of chromium and vanadium. It should not be surprising, therefore, that the finest chrome tourmaline tends to resemble the finer examples of emerald and tsavorite. Chrome tourmaline is actually a distinct tourmaline variety called chrome dravite, found in East Africa.It is often associated with tsavorite garnet; miners will usually concentrate their efforts on tsavorite, as it fetches higher prices.

History
The chrome green tourmaline was found long ago in Africa, in the Ural Mountains in Russia and other passes in Europe, but more important discoveries were made in North Amrican and South America. Gem-quality stones were discovered in the early nineteenth century in the United States in the state of Maine, on Mount Mica near the city of Paris. In 1972, the mine nearby Newry, in the same regin, gave an exceptional quality PRODUCTION for a short time became the world's leading source of high quality stones. Around 1860, the first expeditions in search of gold explorers led the San Diego County, California, where they discovered the pink tourmaline.

Another rare variety is particularly attractive chrome tourmaline from Tanzania, a very attractive green color caused by chromium, which is the same coloring agent of the emerald.

Hue
Like emerald and tsavorite garnet, fine chrome tourmaline is a visually pure "forest" green with slightly yellowish to bluish secondary hues. The blue will normally show itself in incandescent light, the yellow will be more visible in daylight. The same criterion applied to tsavorite garnet and emerald is applicable to chrome tourmaline. A blue secondary hue is preferred to yellow. The product, unlike emerald, can never be said to be too blue. A visibly pure to slightly (five to fifteen percent) bluish green gem between seventy and seventy-five percent tone is the most desirable.

Crystal
Generally speaking,the materialis simply more opaque than emerald or tsavorite garnet. Its hue is vivid but it is also dense. A chrome tourmaline that meets the criteria discussed above and that exhibits good crystal — that is, one that retains its transparency in incandescent light — is the crème de la crème of this species.

Multicolor effect
As tourmaline is the most dichroic of gemstones, a strong multicolor effect is to be expected. However, perhaps due to its unique chemical composition and its distinctly dark tone, multicolor effect is rarely observed in the (CAS No.:1308-38-9) gemstone.

The rarity factor
Chrome tourmaline is quite rare generally, and particularly rare in sizes over one carat. A stone of fine quality over one carat is very rare. Therefore, the collector should expect a large percentage increase in the price of stones in carat-plus sizes. The next jump in rarity occurs at five carats. Stones of fine quality above ten carats are extremely rare, so rare in fact that I have never seen one.

Other supplier products

	What Is Chrome Plating?	Chrome refers to the element chromium. The metal itself is not used as a solid but is always electroplated onto another surface, such as steel, alu...
	The Contract Price Of TiO2 Of North America Remains Unchanged	It is reported that, news sources has confirmed on Tuesday, the contract price of titanium dioxide (TiO2) of North America in these three quarters ...
	English Successfully Used Discarded Tires To Extract Carbon Black	Recently, three British inventors extract the carbon black from discarded tires. The carbon black, which has low price, may be used as a printing i...
	Tetrahydrofuran Description	Tetrahydrofuran, or THF is a colorless, volatile cycloaliphatic ether with an odor characteristic of acetone. It is chemically neutral, highly pola...
	Facts About Glycerin	Some soapmakers which make and sell soap better than store-bought said like this while being asked: "Because of the natural glycerin.It is a h...

供应产品

Same products

	Trichloroisocyanuric acid	卖方: Wuhai Keynes biological science and Technology Co., Ltd	Trichloroisocyanuric acid Molecular formula: C3O3N3CL3. CAS No.87-90-1 PH(1% solution):2.7-3.3...
	Molybdenum Disilicide	卖方: Zegen Metals&Chemicals Limited	MolybdenumDisilicide Particlesize:3-5micron Purity:99.95% Package:1kg/bag,20kg/box
	Yttrium Oxide	卖方: Zegen Metals&Chemicals Limited	Yttriumoxideiswhitepowder,insolubleinacidandsolubleinwater MF:Y2O3 Purity:99.999%(Y2O3/REO99.999%...
	分子筛3A	卖方: 郑州天祥无机材料有限公司	Description Type3A,apotassium-exchangedformoftheTypeAmolecularsieve,isanalkalimetalaluminosilicat...
	Ethyl caprylate	卖方: 南京鑫旭工贸有限公司	•Formula: •C9H18O2 •Molecular Weight: •158.24 •Synonyms: •Methyl caprylate;Methyl n-octanoat...