Saltwater pearls include the Akoya cultured pearls grown in Japanese and Chinese waters. They range in size from 2mm (tiny) to 10mm (rare) and are usually white or cream in color and round in shape.
Australia, Indonesia, and the Philippines produce the South Sea Pearl – the largest of all the pearls. They range in size from 9mm to 20mm and can be naturally white, cream, or golden in color.
Tahitian Pearls are interestingly not exclusively from Tahiti – they’re grown in several of the islands of French Polynesia, including Tahiti. Their typical sizes range from 8mm to 16mm. These naturally colored pearls are collectively called black pearls, but their colors include gray, blue, green, and purple.