gemstone

noun

a crystalline rock that can be cut and polished for jewelry
切り出されて宝石として研磨される結晶質の石
- he had the gem set in a ring for his wife
  彼は妻のために指輪に宝石をはめた
- she had jewels made of all the rarest stones
  彼女はあらゆる最も希少な宝石で作られた宝飾品を持っていた

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