What are the differences between natural and refined pearls?
natural and cultivated pearls grow inside oysters. Natural pearls, however, are naturally formed in oysters, while cultivated pearls are formed in the oysters of the human implantation of the core. Another main difference between them is that the natural pearl has stronger pearls or nacre , layers than a cultivated pearl. The iridescent surface on the pearl comes from the perfect alignment of the crystals to reflect the light. Nacre is 90% calcium carbonate and 10% water and other organic substances. The outer layer may look very different between natural and cultivated pearls; Natural pearls are often less rainbow than refined. Sometimes a strong light is sufficient to see inside the pearls, but it is usually possible to see the pearl inner layers only with a special device similar to X -ray radiation. The cultivated pearls often show a narrow brown line around the core, while natural pearls have none of these growth rings.
The Japanese invented the process of the core method in the harvest of pearls. CoreOystering in oysters is usually greater than the natural pearl would be, because the layers of Nacre will not be so strong in a cultivated pearl. Otherwise, oysters dress with Nacre as a means of protecting themselves from foreign irritants.
Unlike popular thinking, sand grain is usually not sufficiently irritating to the oyster to cause to create a pearl. Natural pearls are often made of fish scale, parasite or piece of shell. On today's market are desired natural and cultivated pearls, but most pearls sold today are cultivated. If pearls are not over 80 years of age, it is a good chance that they are cultivated rather than natural.
Natural pearls are a rare aviet of molluscs capable of producing pearls is almost disappeared due to pearl hunting in the 18th century. Bahrain is one of the few remaining countries that have pearl divers looking for natural pearls. Any type of pearl can be drand, because not every oyster does them. Only one of each 10,000 oysters will produce the pearl and only a few will have the desired shine and shape.
The appearance of natural and cultivated pearls depends not only on irritating, but on water and food conditions where oysters live. Some Chinese pearl farmers grow cultivated freshwater pearls that are very strong in Nacre because they move the pearl core as it grows in oysters, so the resulting shape will be more even rounded. Pearly Akoya are cultivated pearls produced by small Japanese oysters. Rounded beads are implanted in oysters so that the pearls of akoya are usually much rounder than most of the cultivated freshwater pearl.