Term for pearl whose formation was started by the insertion of a piece of mantle tissue into the mother oyster or mussel.

A word used to describe synthetic diamonds, in parallel with cultured pearls.

pearl produced by artificially inducing the formation of a pearl sac, usually by the introduction of a shell bead or square mantle tissue into the body of a possible pearl bearing mollusk (oyster or clam).

Under culture; cultivated.

Characterized by mental and moral training; disciplined; refined; well-educated.

marked by refinement in taste and manners; "cultivated speech"; "cultured Bostonians"; "cultured tastes"; "a genteel old lady"; "polite society"

Microorganisms (like bacteria or viruses) or tissues from plants and animals which are grown outside the body in a prepared medium in a laboratory.