When small sand and pebbles enter the shell, the secretions secreted by the shell react with them. After long-term friction, these substances are wrapped in layers and become pearls over time.

Distinguish the quality of pearls;

Generally, pearls below 6mm do not belong to the category of jewel-grade pearls, and 7-9mm is widely loved by the public. 10mm pearls are rare, and 1 1mm pearls are only Nanyang pearls and black pearls.

Gloss is the soul of pearls. Pearls that are dull and shimmering lack aura. Look at the light, put the pearl flat on a white soft cloth, and you can see the warm luster of the pearl overflowing; Looking at the light, a good pearl can see colorful rainbow light, rich in layers, and can also see a spherical surface similar to metal texture;

The rounder the pearl, the more beautiful it is, which conforms to the aesthetic habits of China people. Round pearls show the beauty of a full moon. Generally, you can see the circle with the naked eye;

The less acne, spots, scars, pits and spots on the surface, the better. Generally speaking, it is an acceptable standard not to see defects at a distance of 0.5 meters.

Every pearl is unique, and it is not easy to find two or more identical pearls. Try to choose pearls with similar luster, size, color and roundness, and match them in pairs.