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Cultured freshwater pearls are pearls which can be farmed and created using freshwater mussels. These pearls are produced in Japan along with the united States over a limited scale but are now almost exclusively produced 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 picking 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 technique just isn't considered difficult and technicians need only minimum training to complete the operation. The technician creates small incisions on the upper valve and inserts the tissue piece. A small twist of the tissue upon insertion is believed to produce a higher ratio of round pearls. After the most amount of grafts are actually performed the mussel is flipped and the procedure is performed yet again on the other valve with the shell.Chinese freshwater mussels were once grafted as much as 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 inside the 1970s and 1980s. More than the usual decade ago the freshwater pearl industry of China shifted production through the cockscomb pearl mussel for the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for a total output of 24 to 32 pearls but produced pearls of better quality.
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