Where Do Pearls Come From?

You may think oysters taste kind of gross, but did you know that some of them hide rare gemstones?
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SOURCES:
http:www.amnh.orgexhibitionspearlswhat-are-pearlshow-pearls-form
https:www.livescience.com32289-how-do-oysters-make-pearls.html
https:wonderopolis.orgwonderdoes-every-oyster-have-a-pearl
http:abc7chicago.comfoodwoman-finds-50-pearls-in-oyster-dinner632954