名词
中文翻译：宝石
同义词：
['amethyst', 'sapphire']
例句：
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1. Opals are highly prized for their beauty and rarity.
绿松石因其美丽和稀有而备受珍视。
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2. The opal was a gift from my grandmother on her birthday.
祖母生日时送给我的一块绿松石作为礼物。
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3. The opal ring is said to have been passed down through generations of the family.
据说这枚绿松石戒指是家族代代相传的。