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More than a decade ago the freshwater pearl industry of China shifted production from the cockscomb pearl mussel to the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls, accepting only 12–16 grafts per valve for a total production of 24 to 32 pearls, but produced pearls of better quality.
Pearl farming in China is mainly concentrated in the southeastern part of the country, with the waterways of Zhejiang province serving as the source for China's freshwater pearls. [1] Production has greatly increased through the 1990s and 2000s, with China, according to Times Online , producing 90% of pearl necklaces globally. [ 1 ]
White pearl necklace. A pearl nucleus or a bead for cultured pearl is a sphere (usually) or other shape (occasionally) formed only by cutting and polishing a nacreous shell used to accommodate the nacre secreted from a graft of mantle tissue, that eventually forms the centre of a beaded cultured pearl. [2]
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
The iridescent nacre inside a nautilus shell Nacreous shell worked into a decorative object. Nacre (/ ˈ n eɪ k ər / NAY-kər, also / ˈ n æ k r ə / NAK-rə), [1] also known as mother-of-pearl, is an organic–inorganic composite material produced by some molluscs as an inner shell layer. It is also the material of which pearls are composed.
A black pearl and a shell of the black-lipped pearl oyster. The iridescent colors originate from nacre layers. All shelled mollusks can, by natural processes, produce some kind of "pearl" when an irritating microscopic object becomes trapped within its mantle folds, but the great majority of these "pearls" are not valued as gemstones.
A single iridescent species of gecko, Cnemaspis kolhapurensis, was identified in India in 2009. [22] The tapetum lucidum , present in the eyes of many vertebrates, is also iridescent. [ 23 ] Iridescence is known to be present among prehistoric non-avian and avian dinosaurs such as dromaeosaurids , enantiornithes , and lithornithids . [ 24 ]
Hyderabad is considered the main pearl trading centre in India, because of which the city is also known as the "City of Pearls". The most notable area devoted to the trade is the village called Chandanpet just outside Hyderabad , wherein almost the entire population is engaged in the delicate art of drilling pearls , a skill they have practiced ...