S

saltwater pearls

natural or cultured pearls produced by a saltwater mollusk.

sautoir

pearl strand longer than 36 inches (90 cm)

second grafts

cultured pearls grown in existing pearl sacs after the first harvest; same as second-generation cultured pearl

second-generation cultured pearls

freshwater or saltwater cultured pearls whose growth is started either by implanting a shell bead nucleus in an existing pearl sac from which a first-generation cultured pearl was removed, or by letting the mollusk grow a beadless cultured pearl in an existing pearl sac from which a first-generation cultured pearl was removed

seed pearls

natural pearls less than 2 mm in diameter

semi-baroque pearls

off-round, asymmetrical pearls but not quite as irregular as a baroque pearls

semi-round pearls

off-round pearls having a symmetrical shape or a slight deviation of symmetry

shinju

Japanese word for pearl

silver-lip mollusk

Pinctada maxima mollusk that has silver rather than gold inner shell edges; used to culture South Sea pearls

South Sea pearl

natural or cultured pearl produced by the Pinctada maxima mollusk

spat

saltwater mollusk larva old enough to attach itself to a fixed surface

surface

one of the quality factors considered when grading a natural or cultured pearl

symmetrical pearl

exactly the same shape on both sides of a central axis