Pearls are mostly calcium carbonate, so they would actually work as antacids. Today, people in the orient use lower grades of cultured pearls for medicine and love potions. They are associated with the moon and sea. Pearl is the birthstone for June. Pearls are organic gems, products of living organisms.
Natural pearls form in freshwater and saltwater, in mollusks such as mussels, oysters and abalone.
An intruder, such as a tiny worm or other material, gets into the mollusk and irritates the animal. Eventually these layers will form a pearl. The more nacre the animal secretes the smoother the coats will become. The more layers of nacre and the thinner the layers, the better the luster the pearl will have. Natural pearls are extremely rare due to the polluted waters.