1. According to relevant data, pearls with good quality are all round. The rounder the better, the stronger the luster and the better the quality. The smoother and more delicate the pearl skin, the stronger the reflected light and the better the luster. However, most of the pearls of the slag son's family are oval, with insufficient luster, slightly dim and occasional spots and defects, so the quality of the pearls of the slag son's family is poor.

2. The body color of pearls can be divided into light series and black series. Light series includes pink, white and cream, among which pink is the best reflected light, and black series includes black, dark green, blue and purple. The best quality is the green reflected light of black pearls, and top-grade pearls must have a strong pearl luster. When you identify pearls, you can put them on a white soft cloth, and when you look at the light, you can see colorful light similar to a rainbow.