gem Meaning, definition in Cambridge English Dictionary
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Meaning of "gem" - English Dictionary

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gemnoun [C]

uk   us   /dʒem/

gem noun [C] (JEWEL)

(also gemstone) a jewel (= precious stone), especially when cut into a particular regular shape

gem noun [C] (VERY GOOD)

someone or something that is very good, pleasing, or useful: You've been an absolute gem - I couldn't have managed without your help. He came out with a gem (= a clever or pleasing remark) about the absurdity of the situation.
(Definition of gem from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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