Freshwater Freshwater Vs Vs Vs Akoya Japanese Cultured Chinese Akoya Pearls Japanese Akoya pearls Hanadama Tahitian black pearls saltwater Pearl
Author: href = "http://www.articlesbase.com/authors/sorrowman/35720.htm"> sorrowman
http://www.wspearl.com
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Pearls have been prized for their beauty and rarity of over four thousand years. The former China, India and Egypt, to Imperial Rome, the Arab world, to Native American tribes, cultures from around the world and throughout history Written enjoyed these unique, biologically based gemstones – much longer than any other gem.
The pearl is the gem which is grown within a living organism. Pearls are formed in oysters or mollusks when a foreign substance (most often a parasite – not a grain of sand) invades the shell of the mollusk, entering the soft tissue of the mantle, and picking up epithelial cells. In response to irritation, epithelial cells form in a bag (known as a pearl sac) which secretes a crystalline substance called nacre, the same substance that is inside the shell of an oyster, which accumulates in layers around the irritant, forming the pearl.
There are about 8000 two different species of shells (bivalve) molluscs, of which only about 20 types are able to routinely produce pearls. Natural pearls have always been extremely rare and valuable. Because the layers of nacre tend to maintain the irregular shape of the original irritation, natural pearls, which are round or spherical shape are even rarer, and are very popular. Most natural pearls are irregularly shaped.
Completely naturally, only a very small percentage of oysters will ever produce a pearl at all. Among the pearls are produced, only a handful will develop to a desirable size, shape and color, and only a small fraction of these will be harvested by humans. It is commonly accepted that Only one in ten thousand oysters will naturally produce a pearl of gem quality. Obviously, if we relied only on nature, ownership of beads would still relegated to only the richest people in the world, and the pearl producing oysters would be on the verge of extinction because of overfishing. As Pearls have been a prized gem by much of the world population for thousands of years, this need led to the development cultured pearls.
In the 19 and early the late 20th century, however, several Japanese researchers have discovered a method of producing artificial beads. Essentially, the technique involves inserting a foreign substance, or nucleus, in the tissues of the oyster or mollusk, then return to creature of the sea and allowing the resulting cultured pearl to develop naturally. This practice was widespread crop Mabe pearls. Kokichi Mikimoto is credited with perfecting the technique for artificially stimulating the development of round pearls in Akoya oysters, receive a patent for this technique 1916. Although patented in 1916, this technique has since been improved and used throughout the world pearl – not only used for pearls cultured Akoya, but freshwater, South Sea and Tahitian pearls also.
Mikimoto discovery has opened the door to a pearl industry significantly enlarged, pearls could be cultivated as a crop, rather than simply sought hit-and-miss. These cultured pearls could now be produced in sufficient quantities to make them accessible to virtually anyone.
The industry of the Pearl has now surpassed far as the industry natural pearl. Although a market still exists pearls gifted to us by nature, these pearls are becoming harder to find, with rare full strands being auctioned for hundreds of thousands of dollars. Today, buying a pearl necklace from almost any store in the world means purchasing a strand of cultured pearls.
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Source Article: ArticlesBase.com – Title = "Freshwater Vs Japanese Akoya cultured freshwater Vs. vs. Chinese Akoya Pearls Japanese Akoya pearls Hanadama Tahitian black pearls saltwater Pearl "> Freshwater Freshwater Cultured Akoya Vs Vs Vs japanese japanese chinese Hanadama Akoya Pearls Akoya Pearls Black Tahitian Pearls Saltwater Pearl
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