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Pearl's formation |
Generally, a nature pearl forms when a piece of sand, work its way into a particular species of oyster. But more than ever, there are other irritant enter the shellfishes, and stimulate them to secrete a fluid toc coat the irritant, layer upon layer until a lustrous pearl is formed. With the development of seeding technology, the irritant is surgically implanted into piece of shell called mother pear. The chief process to culturing pearl is to culture special oyster for generating pearls. Basically, oyster culturing is a different matter from pearl culturing, but both process takes several years. In culturing pearls, first of all, a core with some muscle of oyster, should be implanted into mother oyster, as a defense, the mother oyster secrete a fluid to coat the core, layer on layer, a culture pearl is formed. It is very difficult to culture a perfect pear in quality and shape. It needs the culturing people make much of it with excellent technology. As the same, the jewelry should concentrate on searching these rare pearl gems. The difference between salt and freshwater pearl: 1. Salt pearl is generally round in shape, freshwater pearl is oblate, perform or semicircular in shape. 2. The shine of salt pearl is more brilliant than freshwater pearl. Identification between salt pearl, Imitation pearl and dye pearl When two pearls scrape each other, it has soapy feeling on imitation pearl and uncouthly feeling on real pearl; Use pearl to scrape the glass, we could see that there has no abrasion marks on imitation pearl but there has on the real pearl. Dye pearl is usually weak color. If you wipe it with a cloth with 5% dilute nitric acid, you could see some black spots contaminated on the cloth. |
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