Although pearls can occur in bivalves all over the world, the most sought after pearls tend to come from eastern Asia to the far flung islands of Oceana that span the Pacific, due to their unique colors and size qualities:

 Black-Lipped South Sea Oysters: 
Tahiti, Fiji
Freshwater Mussels:
China, Japan
Gold-Lipped South Sea Oyster: 
Myanmar, Philippines
White-Lipped South Sea Oyster: 
Australia, Indonesia
Akoya Oyster: