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English definition of “gem”

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gem

noun [C]  /dʒem/ us  
a precious stone, esp. when cut into a regular shape; 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)
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