Cultured pearls and pearl

The difference between natural pearls and cultured pearls, which is spontaneously created by nature or not. Pearls are formed inside the shell of crustaceans. On the prevention of potential threats to the stimulus, shellfish creates a pearl to seal the irritation.

Jacket deposits layers of calcium carbonate (CaCO3) in the form of minerals or a mixture of argentite argentite and calcite (both crystalline forms of calcium carbonate) held together by organic horn-shaped. The combination of argentite called nacre, cultured freshwater pearl, that mother of pearl. General belief that a grain of sand acts as an irritant in fact rarely the case. Typical stimuli include organic material, parasites, or even damage the mantle tissue from another part of the animal's body moves. These small particles or organisms enter the animal when the shell valves are open for feeding or breathing. Cultured pearls, an irritant, as a rule, saw the epithelium of the mantle, with the treated beads shell, the combination of an animal takes in his body.

Cultured pearls (origin and not originating or tissue originates cultured pearls) and imitation pearls natural pearls can be distinguished from X-rays. Nucleated cultured pearls are often "pre-formed" because they tend to form the nucleus bead implanted shell to follow. After the pre-formed beads are inserted into the oyster, he identifies several layers of nacre around the outside surface of the implant before after six months or more.

When the lights emerging artificial pearls, it points to another structure, natural pearls. Cultured pearls shows solid center with no concentric growth rings, while the natural pearl shows a series of concentric rings.

Natural pearls are nearly 100% calcium carbonate. It is believed that natural pearls form under a range of accident conditions, when an intruder enters or microscopic parasites of bivalve mollusks, and is located in the housing. Shellfish annoying attacker allocates calcium carbonate to cover the irritant. This secretion process is repeated several times, creating a pearl. Natural pearls come in different shapes, with perfectly round is relatively rare.

Rarity of the black pearl cultivation at the present time, "comparative" issue. Black cultured pearl rare freshwater cultured pearls Chinese, Japanese and Chinese cultured pearls and compared, and more pearls. However, it is often the South Sea pearl is better than the black pearl cultivation. This is simply because the black pearl oyster is much more common than oysters shy and rare South Sea pearls, which can be found in lagoons, china pearl jewelry, but it should be immersed in many of the rare combination of deep-sea habitats or grown in incubators.