The appearance of coral is completely different from that of some pearls of similar color. The pearl of pearl has a certain directionality. When zoomed in at low magnification, it shows a pattern like a flame. The white rosary that is honed into a fake white coral with a shell of pearl can be identified by the parallel growth structure on the shell and its pink zoning tendency. Other distinguishing features of corals are small, shallow circular dimples, which are the growth sites of individual polyps. Small pits caused by certain perforated marine organisms may also be present.
The main substitutes for counterfeit corals are celluloid, wood and sealing wax, none of which has the unique appearance of coral. Celluloid emits a camphor smell when heated, and the wood can be scratched with fingernails to expose the wooden structure under the artificial surface. The sealing wax flows like a glass under a magnifying glass. If necessary, hydrochloric acid can be used to identify these substitutes, as none of them will work with hydrochloric acid. Conversely, coral, shell pearl and shell pearl shell react with hydrochloric acid.
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