oyster
Mother-of-Pearl is found in Oyster shells
Bivalve crustaceans such as oysters have pearls.
Oyster
clams
clams
Pearls are the most common piece of jewelry to be found in the sea. Cheers, 99
Oysters, but very very rarely they are found in clams.
Akoya pearls are be extracted from Akoya oysters. These oysters can be typically found in large bodies of saltwater. For example, Akoya oysters are traditionally found in the sea area of southern China.
Pearls are found in an oyster.
Barnacles and such creatures as those.
Seals
The pearls aren't in the Sea of Monsters. They are in the first book.