| http://www.w3.org/ns/prov#value | - In fact it truly is a pearl, while it may not be the typical round pearls we think of when it comes to pearls it is made by the same organisms that makes pearls, instead of forming around a piece of material the pearls forms on the interior of the shell of the organism, which includes pearl oysters, freshwater pearl mussels, abalone, and several families of mollusks.
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