American Museum Of Natural History - Pearls - Pearls Exhibition | Cherished as symbols of purity and perfection, elegance and affluence, pearls are unusual gems, created inside living animals called mollusks. Occurring naturally in a wide range of sizes, shapes and colors...

PBS - The Perfect Pearl - NOVA Online presents The Perfect Pearl.

Cultured Pearl Information Center - the Cultured Pearl Information Center is a non-profit organization devoted to the dissemination of accurate pearl and cultured pearl related information to the trade and consumer public.