Of all the different types of gemstones that are mined and commercially sold, the pearl is the only one which is not a mineral. Pearl stone is organically formed by living organisms. A pearl gemstone is formed inside a mollusk shell. When an irritant like a sand particle gets inside the shell, the mollusk adds on layer after layer of nacre around it.
https://blog.9gem.uk/different-types-of-pearl-gemstone/
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