克拉是钻石的重量计量单位。

A carat is the universal measure of weight for a diamond.

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其中最重要的特点是它的钻石的重量，这是衡量在克拉。

One of the most important features of a diamond is its weight, which is measured in carat.

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所有合法销售的钻石不论价值几何都有一张“唯一的”通行证，这张证书对钻石的四个方面进行评级——色泽、透明度、切割和重量（克拉）。

All legitimate diamonds of any value have a "unique" passport, a certificate grading the four Cs – colour, clarity, cut and carat.

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