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English definition of “gem”

gem

noun [C] (VERY GOOD)    /dʒem/
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 (= clever or pleasing remark) about the absurdity of the situation.People having good qualitiesGood and excellent things
(Definition of gem noun (VERY GOOD) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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