Cultured pearls are real pearls grown inside living oysters — “cultured” has never meant fake. What the word covers, how the three saltwater families differ, and how to judge a piece before you buy.

Pearls form when displaced mantle tissue builds a pearl sac and layers nacre — aragonite platelets bound with conchiolin — over months. The grain-of-sand story, corrected by a pearl farmer.

A cultured pearl necklace is a strand of real, farm-grown pearls. What "cultured" means, how Akoya, South Sea, Tahitian and freshwater strands differ, and how to choose your length.