Meaning of “gem” in the English Dictionary

(Definition of “gem” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"gem" in American English

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gemnoun [ C ]

us /dʒem/

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)