Look at the texture. Red corals all have longitudinal stripes parallel to the growth direction of corals, and they are closely arranged. In addition, the cross section of red coral has ring patterns similar to tree rings, so we should pay attention to these two textures when we identify them with the naked eye. ?
Longitudinal view: coral has parallel growth lines in the longitudinal direction, and the direction is parallel coral cylinder. If it is a ring surface, it is usually on the back. If it's carved, it's on the surface.
Cultural significance:
Red coral culture has a long history in China, as well as in the traditional cultures of India and Indian nations, especially among the indigenous peoples of India and the Tibetan people in China, who even regard red coral as a sustenance to protect and pray for "God bless". According to historical records, the utilization of red coral by human beings can be traced back to ancient Rome.
The ancient Romans believed that coral had the functions of preventing disasters, giving people wisdom, stopping bleeding and driving away heat. Some navigators believe that wearing red coral can prevent lightning and hurricanes, make it calm and have a safe journey! So the Romans called it "red gold", which cast a mysterious color on the red coral. Coral ornaments have been found in prehistoric tombs in ancient Egypt and Europe.
Reference to the above content: Baidu Encyclopedia-Red Coral