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The History of the Pearl
By about 1600, Anselm de Boot is noted to begin with the shell pearl jewelry in the structure of similar appearance, but after about 100 years, researchers had cut the pearls and the actual shellfish, the French scientist Rene cut the slice placed under the microscope observation and found that the structure of the pearl shell had the similar material, consisting of layers of focus.
In past three centuries before the 20th century, the pearl jewelry industry has undergone tremendous changes, the all-cultured pearls replaced the natural wild pearls. The practice is the sole criterion for testing truth of the pearl. In the 20th century through the practice of cultured pearls, people completely resolved the issue of the formation. Now having ample evidence and sufficient reasons for the formation of pearls is that pearl shellfish according to external stimulation of, secrete pearl quality, a package external layers of the results. Pearl formation of the issue is resolved, the problem what is the pearl will be solved.
Japan done nearly a century of pearl farming practice, and had accumulated rich experience, therefore, of what is called the pearl, we adopted the definition of Japan.
Japanese pearl of the pearl made the following definition: pearl is living in the pearl shellfish formed within the spherical or hemisphere-shaped (or somewhat deformed) things, is a product of metabolism, and it is the appearance of visible part of beads.
This definition of the formation of the location of pearl, pearls’ mother-rearing and pearls, and other shapes made stringent requirements. The “metabolism” of this process is the key. Thus put a distinction between genuine and fake pearls have come. Also pointed out that cultured pearls and natural pearls are real pearls. Apart from the “pearl”, including artificial imitation pearls, pearls are false. That the definition of quality pearls, mother-of-pearl that is secreted by the shellfish material, it is notable thin, very thin this thin, can only be measured in microns, the different colors of pearl quality, not its thickness equal, from 0.38mm to 0.45mm. Different climate different from the waters humidity, the number of pearl production is also inconsistent, the general daily production two to four times, each pearl production of more than 0.3mm thick. Cultured pearls thickness of the year only about 0.3mm to 1mm thick to a long, we need about three years, so that could be used pearl beads in recent years of liquid spray system from the imitation pearl distinguish it from, so this definition offer pearl distinguish a legal evidence.