It's the synthetic diamond.

这是人造钻石。

White synthetic diamond grains were studied.

分析了白颗粒合成金刚石。

The mechanism of synthetic diamond antioxidation is also discussed.

同时，探讨了人造金刚石的抗氧化性机理。

The existing experiment facts on synthetic diamond have been better …

这一理论较园满地解释了现有的实验事实。

The clerk passed off a synthetic diamond to that unsuspecting customer.

这个店员用人造钻石冒充真货卖给了那个轻信的顾客。