名词
中文翻译：宝石
同义词：
['gem', 'gemstone', 'precious stone']
例句：
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1. The diamond is the most valuable gem in the world.
钻石是世界上最珍贵的宝石。
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2. She wore a beautiful necklace made of precious gems.
她佩戴了一条由珍贵宝石制成的漂亮项链。
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3.The gem was so valuable that it fetched a high price at auction.
这颗宝石非常珍贵，在拍卖会上拍出了高价。