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Cultured freshwater pearls are pearls which can be 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. federal Trade Commission requires that farmed freshwater pearls be referred to as freshwater cultured pearls in commerce.The grafting process begins by selecting 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 your technician who performs the operation. Unlike saltwater bead nucleation this method just isn't considered difficult and technicians need only minimum training to complete the operation. The technician creates small incisions around the upper valve and inserts the tissue piece. A small twist with the tissue upon insertion is assumed to develop a higher ratio of round pearls. After the most amount of grafts are actually performed the mussel is flipped along with the procedure is conducted again on the opposite valve in the shell.Chinese freshwater mussels were once grafted up to 50 times per shell or 25 times per valve. This practice was common in the event the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that located be called Rice Krispie pearls inside 1970s and 1980s. More than 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 the total manufacture of 24 to 32 pearls but produced pearls of better quality.
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