N-COUNT Carat is used after a number to indicate how pure gold is. The purest gold is 24-carat gold. 开; 黄金纯度
...a twenty-four-carat gold necklace.
...一条二十四开金的项链。
N-COUNT A carat is a unit for measuring the weight of diamonds and other precious stones. It is equal to 0.2 grams. 克拉 (钻石等宝石的计重单位，相当于0.2克)
The gemstone is 28.6 millimetres high and weighs 139.43 carats.
这颗宝石高28.6毫米，重达139.43克拉。
Stones jump in price at the carat mark.
一克拉以上和一克拉以下钻石的价钱差别很大。
The piece DE resistance is a two-carat diamond.
最高的地方是那枚两克拉的钻石。
“You work so, so hard, ” he answered. “I find three carat [diamonds] in three years.
“你那么卖力，”他答道，“在过去三年中我开采到三克拉钻石，但只是每天弯着腰筛啊筛。”
The repairs included replacing the torch and covering it with twenty-four carat gold.
VOA: special.2009.06.29
Their price has remained stable. "The main difference I have seen is people are moving from 22 carat gold jewelry to diamond jewelry, maybe what they say is true is diamonds are forever, and diamonds always is a lady's best friend,".
VOA: standard.2009.10.17
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