Glossary of Pearl Terms U

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Unio: Genus in the Unionidae freshwater mussel family. Several species in the genus produce nacreous pearls.

Underwater platform: Used in French Polynesia as a temporary care station from which mollusks are suspended after implantation of a bead nucleus and donor-mollusk tissue piece.

Uroko: Japanese term for scaly spots on akoya cultured pearls.
 
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