WordReference Random House Unabridged Dictionary of American English © 2020
precious stone, 
  • Jewelrya gem distinguished for its beauty and rarity, used in jewelry.
    • Middle English 1250–1300

    Collins Concise English Dictionary © HarperCollins Publishers::
    precious stone n
    1. any of certain rare minerals, such as diamond, ruby, sapphire, emerald, or opal, that are highly valued as gemstones
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