Assertion: oyster's pearl | /r/HasProperty | produced
Facets:
value: from freshwater mussel species
type: OTHER
Source sentences:
text: Cultured pearls take 3-6 years to reach a commercial size and are produced by placing a polished piece of mussel shell inside the oyster.
text: Pearls are also produced from freshwater mussel species unrelated to pearl oysters.
text: Pearls are also produced from freshwater mussel species unrelated to pearl oysters.