Gem Diamonds and rubies are well-known gems.

钻石和红宝石都是大家熟知的宝石。

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HPHT gradient temperature method is an effective technique to grow gem diamonds.

高压温度梯度法是一种有效的合成宝石级金刚石单晶的方法。

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A 196-carat rough white stone (see photo) was found by Gem Diamonds at the company's mine in Lesotho, a small kingdom in South Africa, the Daily Mail of London reported.

据英国《每日邮报》报道，伦敦钻石公司Gem Diamonds在南非小王国莱索托的钻矿，新发现一粒196克拉的白钻原石(见图)。

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In 2008 Graff achieved full vertical integration when he bought a stake in publicly traded diamond miner Gem Diamonds.

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In 2008 he achieved full vertical integration when he bought a stake in publicly traded diamond miner Gem Diamonds.

FORBES: Laurence Graff

The D color, flawless clarity stone is part of the Type IIa subgroup, which comprise less than 2 percent of all gem diamonds.

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