Definition of gem noun from the Oxford Advanced Learner's Dictionary

     

    gem

     noun
    noun
    BrE BrE//dʒem//
     
    ; NAmE NAmE//dʒem//
     
    Jewellery
     
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  1. 1(less frequent gemstone
    BrE BrE//ˈdʒemstəʊn//
     
    ; NAmE NAmE//ˈdʒemstoʊn//
     
    )
    a precious stone that has been cut and polished and is used in jewellery synonym jewel, precious stone a crown studded with gems See related entries: Jewellery
  2. 2a person, place or thing that is especially good This picture is the gem (= the best) of the collection. a gem of a place She's a real gem! compare jewel
  3. Word Origin Old English gim, from Latin gemma ‘bud, jewel’; influenced in Middle English by Old French gemme.Extra examples The second side of their new album contains some real gems. This is a gem of a show. a belt studded with priceless gems a millionairess dripping with gems and pearls architectural gems like York Minster architectural gems like the Taj Mahal
See the Oxford Advanced American Dictionary entry: gem