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English definition of “gem”

gem

noun [C]     /dʒem/
STONE a valuable stone , especially one that has been cut to be used in jewellery JewelleryPrecious and semi-precious stonesTypes of rock
SPECIAL PERSON/THING informal someone or something that you like very much and think is very special : She's an absolute gem.Virtue and moral good
(Definition of gem noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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