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Tsavorite or tsavolite is a variety of the garnet group species grossular, ... (1 carat = 200 mg), tsavorite has been found in larger sizes. In late 2006, a 925-carat ...
Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania , in a very small mining area approximately 7 km (4.3 mi) long and 2 km ...
He also practiced on a 31.57 carat tsavorite, working nine to eleven hours a day for five days on the smaller stone. The actual cutting of the larger tsavorite took about a month. The entire process was thoroughly documented from beginning to end. The finished stone is a square cushion cut with 177 facets, and the final weight is 116.76 carats ...
Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals.Andradite is a calcium- and iron-rich garnet.The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color.
They have the ability to purchase large amounts of rough and have wholesale and retail distribution networks in place to facilitate the sale of loose tanzanite and finished jewellery. In August 2013 TanzaniteOne [4] announced they had opened an online boutique, www.tananiteoneonline, which sold tanzanite gemstones and tanzanite set gold ...
A highly sought after variety of gem garnet is the fine green Grossular garnet from Kenya and Tanzania called tsavorite. This garnet was discovered in the 1960s in the Tsavo area of Kenya, from which the gem takes its name. Viluite is a variety name of grossular; that is not a recognized mineral species. [6]
This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.
Campbell R. Bridges (1937 – 11 August 2009) was a Scottish-born Kenyan gemologist. [1]Bridges, originally from Scotland, lived in Kenya with his family and regularly mined for rare gemstones with his son Bruce Bridges. [2]
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