As a marine organism, coral leaves growth lines similar to tree rings during its growth. This growth line is mainly parallel growth, and will gradually become larger with the passage of time, just like concentric circles. The growth direction of the whole growth line is parallel to the coral column. However, this growth line is easy to find on lighter corals, while the darker ones need careful observation. Color is also a good way to judge whether coral jewelry is true or false. The color of true coral shows a trend from the inside out, from shallow to deep, and the closer it is to the inner layer, the darker it will be. Therefore, it can be said that the overall distribution of coral color is uneven. According to this feature, those corals with the same color inside and outside are most likely from artificial textiles.

Article transferred from: National Cultural Market Survey and Evaluation Center