寶啾寶石 報報 : Gem Diamonds Finds 6th 100-Carat-Plus Stone This Year 這幾天的 寶石 NEWS,今年 Gem Diamond s找到第六顆大於100克拉的 鑽石 原石。可參考附圖,快和10倍放大鏡一樣大了。 This 115-carat rough diamond is the latest in a string of big finds this year for London-based miner Gem Diamonds . The mining company said it is a D color, Type IIa stone. September 20, 2017 London--Mining company Gem Diamonds announced this week it has unearthed another big, high-quality rough diamond from the Letšeng Mine in Lesotho. The stone is 115 carats and is a D color, Type IIa diamond, meaning it has no measurable nitrogen or boron impurities. Type IIa diamonds are the most chemically pure, and it's estimated that only about 1 percent of the world's diamonds are Type IIa. The announcement, made Tuesday, follows Gem Diamonds's recovery of five other diamonds weighing more than 100 carats this year at Letšeng, which is known for producing big, valuable diamonds. The largest of the stones recovered so far this...
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