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Rare in gem-quality over several carats (1 carat = 200 mg), tsavorite has been found in larger sizes. In late 2006, a 925-carat (185.0 g) crystal was discovered. It yielded an oval mixed-cut 325 carat (65 g) stone, one of the largest, if not the largest, faceted tsavorites in the world.
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 ...
The socio-economic dynamics of the gemstone industry are shaped by market forces and consumer preferences and typically go undiscussed. Changes in demand and prices can significantly affect the livelihoods of those involved in gemstone mining and trade, particularly in developing countries where the industry serves as a crucial source of income ...
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 ...
Sapphire Origin Date Size Cut Color Location Ref Star of Adam: Sri Lanka 2015 1,404.49 carats (280.898 g) Star Blue Anonymous owner [3]Black Star of Queensland
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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