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Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are made in Japan and the united States on a limited scale but are now almost exclusively created in China. The U.S. Ftc requires that farmed freshwater pearls be called freshwater cultured pearls in commerce.The grafting process begins by choosing a suitable donor mussel and cutting a strip of tissue in the mantle. This strip of tissue is then cut into three-millimetre squares. These squares are delivered to a technician who performs the operation. Unlike saltwater bead nucleation this method just isn't considered difficult and technicians need only minimum training to do the operation. The technician creates small incisions on 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 number of grafts are actually performed the mussel is flipped along with the procedure is performed once more on another valve in the shell.Chinese freshwater mussels were once grafted around 50 times per shell or 25 times per valve. This practice was common if the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that came to be known as Rice Krispie pearls inside the 1970s and 1980s. More when in comparison to a decade ago the freshwater pearl industry of China shifted production through 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.
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