Coral has parallel growth lines in the longitudinal direction, and the direction is parallel coral cylinder. On the cross section of coral, there are growth lines like large and small rings. Growth lines with concentric circles usually appear on coral ornaments. The color of coral is from the inside out, such as a coral column. The closer to the surface, the darker the color of coral, the deeper the layer and the lighter the color. In other words, the color of coral is uneven. If the color of coral is the same inside and outside, it will be suspected to be fake!

It is important to see whether the red color of coral jewelry is pure, and to know whether it has been dyed. The price of dyed coral is much lower. Also, it depends on whether the coral structure is dense. If there are many holes in it, or it feels light, generally don't spend a lot of money.