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Natural Pearls Appear naturalAppear naturalAppear To prized summer for their beauty and their rarity for more than four thousand years. Old China, India, and of Egypt, to Imperial Rome, to the Arabic world, to the tribes of Amerindian, the cultures of around world and through the recorded history estimated of the appear longer than no other gem. Appear them are the only gems the growing interior of a living organism. Appear them are formed in the oysters or in the mollusks when a foreign substance (most often a parasite - not a grain of sand) invades the shell of the mollusk and between the fabric of soft coat. In response to the irritation, the cells of the coat edpithedlial form a pocket (known as a pocket of appears) that secretes a crystalline substance makes pearly called, the same substance that forms the interior of a shell of the mollusk, that develops in the put to bed around the irritating, forming an appears. There are roughly 8,000 different types of mollusks bivalves, of which only about 20 are able uniformly producing of the appear. Appear them natural are extremely rare. Because the put to bed mother-of-pearl tend to maintain the irregular form of the irritating original, appear them natural that are in round or spherical in the form are even rarer. Most of the appear natural irregularly are formed. In a completely natural state, only a very small percentage of mollusks never will produce an appears and only little of will develop them a size, a form, and a desirable color; only a small fraction of those will be harvested by the humans. It ordinarily is supposed that the one in ten thousand mollusks produces naturally the quality of gem appear. Evidemment, if we counted only on the nature, the possession of appear Always would be relegated to the richest one and to appears it produces mollusks would be at two fingers of the duty of extinction to the on harvest. As appear them were prized for year thousands, this must have taken to the development of appear cultivated. Posted on February 4, 2010.
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