Pearls are found in an oyster.
pearls
the ocean
Cave pearls are a calcite formation found in caves that resemble pearls because they are white and round.
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pearls are found in the lakes like lewisville lake, and sometimes if your lucky they can come up from your toilets
Pearls are not considered as rare as diamonds, but they are not found in every oyster either. Pearls in the wild are rare and more expensive. Cultured pearls are much more common.
Native Americans may have found "pearls" in clams, but those were not "pearls" as we would consider them today. Clams are non-nacreous mollusks and do not produce actual pearls. They produce what are known as "calcareous concretions", which lack the pearly luster associated with pearls as we know them. More likely, Native Americans found pearls in mussels not clams. Those that were near coastal areas may have also found and collected marine pearls, but not from clams.
Make pearls and are food to Humans, animals, etc
Oyster
clams
clams