1. Mother of pearl is growth in the lake of China mainland, about 2 years later they will embed pearl seeds, and then continuously breed them for 4-8 years. When the clam has been growth up, they will be sold and killed by the professional people for getting the pearls out. Hence, the unuseful shells will re-sell to some mosaic factories for processing to different kind of products. Including Flower shell, seaflower shell and colorful shell.