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Cultured freshwater pearls are pearls which can be farmed and created using freshwater mussels. These pearls are produced in Japan as well as the united States on the limited scale but have become almost exclusively created in China. The U.S. Ftc requires that farmed freshwater pearls be known as freshwater cultured pearls in commerce.The grafting process begins by picking a suitable donor mussel and cutting a strip of tissue from the mantle. This strip of tissue is then cut into three-millimetre squares. These squares are delivered with a technician who performs the operation. Unlike saltwater bead nucleation this technique isn't considered difficult and technicians need only minimum training to perform the operation. The technician creates small incisions for the upper valve and inserts the tissue piece. A small twist in the tissue upon insertion is considered to develop a higher ratio of round pearls. After the utmost quantity of grafts have been performed the mussel is flipped as well as the procedure is completed again on the opposite valve with the shell.Chinese freshwater mussels were once grafted up to 50 times per shell or 25 times per valve. This practice was common once the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that found be referred to as Rice Krispie pearls within the 1970s and 1980s. More when compared to a decade ago the freshwater pearl industry of China shifted production from your cockscomb pearl mussel towards the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for any total production of 24 to 32 pearls but produced pearls of better quality.
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