名词
中文翻译：宝石
同义词：
['gem', 'jewel', '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.
她佩戴着一条由珍贵宝石制成的漂亮的项链。
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3. The ancient artifact was a rare gem in its time.
这个古代文物在当时是罕见的珍宝。