carat

例句：

1. 1. The diamond is worth a carat of gold.
   这颗钻石价值一克拉黄金。
2. 2. She wore a necklace with a carat of diamonds.
   她戴着一串带有一克拉钻石的项链。
3. 3. The price of the ring was based on its carat weight.
   戒指的价格基于其克拉重量。