What is a Gem? - International Gem Society
https://www.gemsociety.org/article/what-is-a-gem/
Web ResultMost gems are minerals, but some — notably pearl and amber — are organics. Living organisms create these materials. By definition, a mineral must be created inside the Earth. Hence, pearls fall into a different category. (To add some confusion, a pearl's coating is a mineral, even though pearls form inside a mollusk ).
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