Pearl is a rare gem, which is cultured from shellfish and mainly produced in tropical and subtropical shallow waters. A shellfish can breed 1 or 2 marine pearls, and freshwater pearl mussels can breed 30 or 40 freshwater pearls.

Pearl is a rare organic gem, mainly produced in tropical or subtropical shallow waters. China's producing areas are concentrated in Hepu, Sanya and Lingshui counties in Guangxi. Pearls are generally round and are the most ideal pearls, but the output is very rare. Compared with freshwater pearls, seawater pearls are cultured with cores, and the surface luster is brighter, but there are some defects in appearance, while freshwater pearls are softer in luster.

Species of pearls

Common pearl varieties are freshwater pearl, Nanyang pearl, Okaya pearl and Tahiti black pearl. Freshwater pearls mostly come from China, and are collected from hybrid shells or mussels of Ma Xianzhen wood. Nanyang Pearl is a guide to natural or cultured seawater pearls in the Pacific coast. Okaya pearls are produced in the coastal bay area of southern Japan, and Tahiti pearls are produced in coral atolls of French Polynesia in the South Pacific.

The round pearl is the one with the best roundness, which is also commonly known as the walking pearl in business. The ratio of the difference between the maximum diameter and the minimum diameter to the average diameter is less than 1%. Round pearls are very round pearls with a diameter difference of 1%-5%. Nearly round pearls are pearls with similar shapes, and the diameter difference is between 5% and 10%.