A cultured pearl is a pearl formed by an oyster, composed of concentric
layers of a crystalline substance called nacre deposited around an irritant
placed in the oyster's body by man. Natural pearls are formed by deposits of
nacre around an irritant which accidentally lodges within the body of an oyster.
Anything else which resembles a pearl but has a surface created by a
manufacturing process is an imitation or simulated pearl - and must be labeled
as such! 
VALLEY JEWELERS Phone/Fax:
925-313-9335
516 CENTER AVENUE
MARTINEZ, CA 94553