名词
中文翻译：卡拉
同义词：
['carat', 'karat', 'carat weight']
例句：
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1. The diamond is a rare and valuable gemstone.
这颗钻石是稀有而珍贵的宝石。
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2. The ruby has a rich red color that makes it stand out.
这颗红宝石颜色鲜艳，非常引人注目。
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3. The goldsmith carefully measured the weight of the gold before casting it into a ring.
金匠仔细测量了黄金的重量，然后将其铸成戒指。