Pearls vary in quality and are graded on seven factors
Size: Pearls are measured in millimeters (mm); 25.4 millimeters equals 1 inch, so, a 6 mm pearl is just under one-quarter-inch in diameter.
Color: White pearls are most common, however, pink, gold, silver and many other colors are available--the black pearl is especially popular.
The Tissot Flower collection is a ladies watch with an emphasis on youthful design. The bezel consists of petals which open and close as you rotate the bezel. The petals come in an assortment of very pretty colors on enameled steel. Likewise the straps come in complementary colors of satin leather. Many of the dials are of mother-of-pearl.
The Carson collection is of traditional design; round dial, small link strap, thin arms and sparse dials with simple hour markers. The movements are mechanical automatic. The case is of stainless steel with straps available in stainless steel or a mixture of steel and gold gilt links. The collections includes both gents and ladies watches.
Mother of pearls are created by the mollusc species from their epithelial cells from the mantle tissue. Over time, the molluscs continually deposit layers on the inner surface of the shell. This action presents two purposes. One, as defense against parasites which could damage the detritus and two, it smoothens the shell of the mollusc itself.
The process of encystation occurs when the molluscs get invaded by a parasitic organism or in cases when they are invaded by a foreign object which the mollusc cannot spew out. What happens is that the parasite or foreign object gets enclosed in the layers of the mother of pearl that the mollusc continually deposits. This continuous process of depositing several layers eventually creates the pearls that are marketed by jewelers to the public. Until the mother of pearl is taken from the mollusc, the pearl continues to grow bigger.
The inner layer is unique because of its iridescence. A characteristic that jewelers and the public alike find very attractive. The same characteristic is primarily due to the thickness of the platelets comparable in size to the visible light's wavelength, which translates to about 0.5 micrometers. This produces a play of light due to the different wavelengths which occurs when light is allowed to pass through it from different angles.
Major sources of mother of pearl finds come from the freshwater mussels. This species normally live in the waters of Asia, Europe and the United States. The same mother of pearls can also be seen in pearl oysters of warm tropical waters as well as the abalone of the Japan, California and the Pacific.
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Orignal From: Pearls vary in quality and are graded on seven factors
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