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Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are designed in Japan and the united States on the limited scale but are actually almost exclusively manufactured in China. The U.S. federal Trade Commission requires that farmed freshwater pearls be called freshwater cultured pearls in commerce.The grafting process begins by selecting 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 method just isn't considered difficult and technicians only need minimum training to execute the operation. The technician creates small incisions on the upper valve and inserts the tissue piece. A small twist with the tissue upon insertion is assumed to produce a higher ratio of round pearls. After the maximum quantity of grafts have been performed the mussel is flipped and the procedure is performed once more on one other valve with 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 an increased volume of low-quality pearls that located be referred to as Rice Krispie pearls inside the 1970s and 1980s. More compared to a decade ago the freshwater pearl industry of China shifted production in the cockscomb pearl mussel towards the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for a total creation of 24 to 32 pearls but produced pearls of better quality.
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