Topaz makes an ideal gem. A good hardness and desirable colors, combined with a relative abundance and availability makes it one the most popular gemstones. The most valuable colors of Topaz are the golden orange-yellow type, called Imperial Topaz, and the dark pinkish-red and orange-red colors. Value increases with a deepness of color in orange and reddish hues. The most commonly used colors of Topaz in jewelry are the blue types.The largest Topaz producer is Brazil. Other deposits are in Pakistan, Afghanistan, India, China, Burma (Myanmar), Sri Lanka, Japan, Russia, Ukraine, Australia, Madagascar, Namibia, Nigeria, Zimbabwe, Mexico, and the U.S. (California, Utah, and New Hampshire).
* Tourmaline >
Tourmaline is the most colorful of all gemstones. It occurs in all colors, but pink, red, green, blue and multicolored are its most well-known gem colors. Scientifically, tourmaline is not a single mineral, but a group of minerals related in their physical and chemical properties. The mineral Elbaite is the member of the Tourmaline group that is responsible for almost all the gem varieties.Important deposits of Tourmaline are in Afghanistan, Pakistan, Russia, Burma (Myanmar), Sri Lanka (Ceylon), and the United States (California and Maine). Several African countries have recently become big producers of gem Tourmaline, specifically Madagascar, Namibia, Mozambique, Tanzania, Nigeria, and Malawi.
* Tsavorite >
Tsavorite is a trade name for the emerald-green variety of grossular garnet that originates in Africa. Tsavorite has become one of the most popular and expensive Garnets, due to its rarity combined with effective marketing tactics. This gemstone was first discovered in Tanzania in 1967. Tsavorite makes a fine rare green gemstone, and is used in various forms of jewelry, especially in rings, earrings, and pendants.
* Turquoise >
Turquoise is an ancient gemstone, and has been highly regarded in many of the world’s civilizations. Among the ancient empires it is best known among the Persian and Native American civilizations, where it was the most popular ornamental gemstone. Turquoise today remains a popular gemstone, and is one of the most important opaque gemstones. It is highly regarded due to its unique turquoise-blue color, and is the only gemstone to have an exclusive color named after it. Other varieties of Turquoise include Eilat stone, Kingman turquoise, Navajo turquoise, and Persian turquoise.
* Uvarovite >
Uvarovite is the rarest of the familiar Garnets, and is seldom used as a gem. It only occurs in very small crystals, and crystals are rarely large enough for faceting. The color of Uvarovite is a deep chrome-green, and Uvarovite is a unique Garnet being that it only comes in one color. The most common habit of Uvarovite is in tiny lustrous crystals coating a matrix. This drusy form of Uvarovite, from the most famous deposit of this mineral in Russia, sparkles with an intense deep green color, and is occasionally polished in this form together with the matrix. Crystals large enough to be faceted and with transparency are extremely rare and are faceted only for collectors.
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