diamond of the purest water

例句：

1. 1. The diamond is the most valuable gemstone in the world.
   钻石是世界上最珍贵的宝石。
2. 2. She wore a diamond ring on her left hand.
   她左手戴着一个钻石戒指。
3. 3. Diamonds are often used to make jewelry.
   钻石常用于制作珠宝。