Saltwater Pearls Defined
A saltwater pearl is a pearl produced by a saltwater mollusk in a saline environment.
Traditional Saltwater Pearls
Traditionally, most pearls were gathered from saltwater-dwelling mollusks in the Persian Gulf, the Red Sea and the coastal waters of India and Japan. These saltwater pearls were referred to as marine pearls. Natural saltwater pearls are still found, but the yield is too small to amount to significant market share.
Saltwater Pearls Today
Pearls cultured in mollusks inhabiting saline waters are considered saltwater pearls. The three most common types of saltwater pearls are akoya, Tahitian and South Sea pearls.
Shape of Saltwater Cultured Pearls
Saltwater cultured pearls tend to be more round than freshwater cultured pearls. This is due to the fact that saltwater mollusks are universally bead-nucleated. Unless the saltwater pearl is a keshi pearl, it will have a bead core.
Saltwater Pearl Culturing
Saltwater pearls are cultured by prying open the mollusk 2-3 centimeters. A technician then uses a special instrument to make a tiny incision on the gonad (reproductive organ) of the mollusk. A small bead nucleus is inserted into this hole, followed by a tiny piece of mantle tissue, which is then placed behind it. The epithelial cells in this mantle tissue begin to multiply, growing around the nucleus producing a pearl sac. This is where the pearl grows. This process is the same for all saltwater pearls cultured with a bead nucleus today.