Noun gemstone has 1 sense
  1. gem, gemstone, stone - a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones"
    --1 is a kind of crystal
    --1 is a part of jewelry, jewellery
    --1 has particulars: cabochon; opaque gem; transparent gem
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