The reason why seawater pearls are expensive is mainly because their growth environment is difficult to control, the survival rate is low, the cultivation time is long and the cost is high. Usually, each seawater pearl oyster can only produce 1 to 2 pearls.

Freshwater pearl oyster can be prolific and yield is higher. In addition, seawater pearls are usually bigger, rounder and brighter, which makes seawater pearls more valuable in jewelry.