If it is a live clam that takes pearls, the clam can live. That is to say, the pearl mussel is opened with a shell opener, a knife edge is cut on one side of the pearl sac, and the pearl is squeezed out of the pearl sac with a jacking fork, so that the pearl sac remains in the mantle, and the pearl is re-secreted by the epithelial cells of the pearl sac to form pearls. One mussel can be recycled for many times, with high resource utilization rate, labor and cost saving, short culture cycle and high annual economic benefit.
However, pearl harvesting usually adopts the method of killing pearl mussels and taking pearls out of pearl bag. In this way, a mussel can only cultivate pearls once, and its resource utilization rate is only once. If it wants to get pearls again, it must start a series of production activities such as breeding, transplanting and breeding of mussels again.
Extended data:
Main items when selecting pearls:
1, Pearl varieties: Generally, pearls are divided into seawater pearls, freshwater pearls and artificial pearls, and freshwater pearls are more common, and the prices are relatively moderate. The rarer the yield, the higher the value. Nanyang pearls are better than Tahiti pearls, followed by China seawater pearls and China freshwater pearls.
2, smoothness: pearls without luster lack aura. A-level pearls look at the light, the reflected light is particularly bright and sharp, and the surface is like a mirror. If the grade is poor or fake, it will look bleak. At the same time, the fewer defects such as acne, spots, marks and pits on the surface, the better, and the smooth surface is the best.
3. Roundness: The rounder the pearl, the better, and the price of a round pearl is several times higher than that of an oval or oblate pearl.
4. Size: The bigger the pearl size, the rarer it is, the more valuable it is. Generally, pearls below 6MM are not included in the category of jewel-grade pearls, while those of 7-9MM are more common, and 10MM is very rare. Only Nanyang pearls and black pearls have more than1mm..
Baidu Encyclopedia-Pearl