2010年7月29日星期四

The Classic Tahitian Pearls

The pearls obtained are cleaned, washed and processed to meet the requirements. The Tahitian pearls have certain standards which sets it apart from all other varieties of pearls. For example, 80% of the pearl su***ce should contain nacre substance in order to qualify as a Tahitian black pearl. Anything less than the above mentioned number, would be considered as a reject. Lots of varieties of Tahitian jewelry are available today which are highly expensive. But there are certain varieties of the Tahiti pearls which are not as expensive as a Tahiti black pearl. The best examples are the charcoal colored pearls and silver colored pearls which are reared from black lipped oysters.These spat are then reared under water for approximately three years to ensure that they grow up in the perfect conditions. Black lipped oysters are very sensitive and rearing them is a tough task. Once the oysters are mature enough, they are grafted with small round structure called ;Mother of Pearl; into their body by surgical methods. ;Mother of Pearl; is the material onto which the pearl forming substance, the nacre deposits. In fact Nacre is also referred as ;mother of pearl;, but here in the case of cultivation of black pearls, they are artificially grafted into the bodies of black lipped oysters.Nacre is a composite material containing aragonite, calcium carbonate, chitin etc which are essential for the formation of Tahitian pearls. The grafting of ;Mother of pearl; into the body of the oysters renders increased secretion of nacre, thus ensuring that pearls are formed in a relatively quick time. The nacre secretions get deposited gradually and after a period of 30 months to 35 months, the oysters are opened to get the pearls.