gem Definition in the Cambridge English Dictionary
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Definition of “gem” - English Dictionary

Definition of "gem" - American English Dictionary

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gemnoun [C]

 us   /dʒem/
a ​preciousstone, esp. when ​cut into a ​regularshape; ​jewel: The ​necklace was ​studded with ​diamonds, ​rubies, and other gems. If you say that something or someone is a gem, you ​mean that you ​value the ​quality or ​beauty of that ​person or thing ​highly: The ​building was an ​architectural gem.
(Definition of gem from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "gem" - British English Dictionary

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gemnoun [C]

uk   us   /dʒem/

gem noun [C] (JEWEL)

(also gemstone) a jewel (= ​preciousstone), ​especially when ​cut into a ​particularregularshape

gem noun [C] (VERY GOOD)

someone or something that is very good, ​pleasing, or ​useful: He's a real gem - you'd be a ​fool to ​break up with him. The ​coffeehouse is a hidden gem (= something that not a lot of ​peopleknow about).
(Definition of gem from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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