Pearls produced in oysters inhabiting saltwater are saltwater pearls. The three most common types of saltwater pearls are South Sea pearls, Tahitian pearls and Akoya pearls.
Saltwater pearls tend to be rounder than freshwater pearls. This is because saltwater oysters are bead nucleated.
Saltwater pearls are more valuable than freshwater pearls with South Sea pearl highest, Tahitian pearls second and Akoya pearls third with equivalent quality.