Noun gem has 5 senses
  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
  2. gem, treasure - art highly prized for its beauty or perfection
    --2 is a kind of art, fine art
  3. jewel, gem - a person who is a brilliant and precious as a piece of jewelry
    --3 is a kind of person, individual, someone, somebody, mortal, human, soul
  4. muffin, gem - a sweet quick bread baked in a cup-shaped pan
    --4 is a kind of quick bread
    --4 has particulars: bran muffin; corn muffin; popover
  5. jewel, gem, precious stone - a precious or semiprecious stone incorporated into a piece of jewelry
    --5 is a kind of jewelry, jewellery
    --5 has particulars:
     solitaire; diamond; ruby; pearl; emerald; sapphire
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