Popular and common pearls are usually spherical in shape. They are formed by mollusks, which attempts to get rid of irritants that enter their shells as foreign objects or minute worms. A study conducted by scientists showed that the larva of a tapeworm is responsible for the irritation, causing the mollusk to secrete nacre coating to the irritant and forming the pearl. In freshwater mussels, flukes also act as irritants. But in general, sand is the most common culprit that forms the nucleus. The mollusk surrounds the irritant and excretes nacre, which solidifies into a thin layer. After which, more and more concentric layers re formed until a spherical pearl is formed. Baroque pearls, on the other hand are solid but not so well-shaped. They are irregularly shaped and can come from freshwater pearls to saltwater pearls. They can be oval shaped or teardrop-shaped. Some Akoya pearls or the Japanese saltwater cultured pearls are also considered baroque. Mollusks or mussel shells are inserted with a foreign object that makes the animal react by secreting nacre to coat the irritant. The Japanese have pioneered in this type of industry, culturing pearls as early as the 1920s. They use a mother-of-pearl bead inserted into the mollusk or mussel, usually three-quarters to nine-tenths of the diameter of the desired size or shape of the pearl.
Cultured pearls usually form spherical shapes but baroque pearls are produced through the culturing process. In the past, they have been considered failed attempts but they are now highly valued for their color and their distinct shapes.
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