Pearl with a mother of pearl bead center. In the cultured pearl industry, the resources used to create a mistaken all nacre baroque pearl is a drain on the production of round cultured pearls. Therefore, they are trying to improve culturing technique so that keshi pearls do not occur. All nacre pearls may one day be limited to natural found pearls. Today many "keshi" pearls are actually intentional, with post-harvest shells returned to the water to regenerate a pearl in the existing pearl sac. Tahitian pearls, frequently referred to as black pearls, are highly valued because of their rarity; the culturing
Pearl of Lao Tzu pearl was estimated to achieve $300,000 to $400,000, but it was not sold. Pearl of Lao Tzu The Pearl of Lao Tzu (also referred to as Pearl of Lao Tze and previously as Pearl of Allah) used to be the largest known pearl. The pearl was found in the Palawan sea, which surrounds the island of Palawan in the Philippines, and was found by a Filipino diver. It is not considered a gemstone pearl, but is instead known as a "clam pearl" or ""Tridacna" pearl" from a giant clam. It measures 24 centimeters in diameter (9.45 inches) and weighs 6.4