pearl oyster

A pearl oyster is a large marine bivalve mollusk, often belonging to the genera Avicula or Pinctada. These oysters differ from common oysters by possessing a byssus, a structure used for attachment. They are found in various regions, including the East Indies, Persian Gulf, northern Australian coasts, and the Pacific coast of America.1

The pearl-making process begins when a foreign particle, such as sand or a parasite, enters the oyster's shell. To protect itself, the oyster's mantle tissue secretes layers of nacre, also known as mother-of-pearl, around the irritant. This material, composed mainly of aragonite and conchiolin, gradually builds up over years, forming a pearl. The size, shape, and color of the pearl depend on the oyster species and its environment. While edible oysters produce lusterless pearls, certain species, particularly those in the Persian Gulf and Gulf of Mannar, yield fine natural pearls.234