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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MINERS in the southern African kingdom of Lesotho have found one of the world's largest diamonds, a near-flawless white gem weighing nearly 500 carats, mining group gem diamonds said last Sunday.

矿工在南部非洲莱索托王国已经找到一个世界上最大的钻石，接近完美的白宝石重量将近500克拉，矿业集团钻石上周日说。

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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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