Unlike other gems that are cut, shaped and polished to bring color brilliance and shine, pearls are natural gems. Basically, pearl is a natural product of an oyster's body defense mechanism. They grow inside their mother oysters with a shimmering iridescence, luster and soft inner glow that are unlike in any other gem on this earth. Natural pearls grow naturally in oysters living at sea without the human intervention. When any irritant or a parasite enters inside an oyster or mollusk then the process of natural coating begins with layer upon layer of nacre inside the oyster. Natural pearls are rarely found now whereas cultured pearls are very real and genuine. These cultured pearls are formed with the human help when a nucleus is implanted inside the oyster and then the process of coating begins with layers upon layers of iridescent substance called nacre and it takes about 2-5 years to form a complete pearl depending upon techniques and where pearls are grown, sea or rivers among other conditions. Reflection and refraction from the translucent layers truly determines the unique luster quality of pearls. The display of iridescence in pearls is result of overlapping of successive layers.
Difference in cultured and natural pearls can't be made with naked eyes; however, distinction becomes very prominent when seen through x-rays. Cultured pearls are used in pearl jewelry as well as in cosmetics. One should also be careful about imitation pearls. Cultured pearls are generally in white colors but can be colored-enhanced in various colors.
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Orignal From: Unlike other gems that are cut, shaped
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