Corals can be divided into shallow sea corals and deep sea corals. Shallow-sea corals are widely distributed. There are many small islands composed of coral reefs in the shallow waters of the Pacific, Indian and Atlantic oceans. The density of shallow sea coral is less than 2 and the hardness is less than 2. It cannot be used as a raw material for carving artworks and can only be used as a strange stone for viewing.
Shallow-sea corals are also called reef-building corals. The coral reef platforms developed from them can greatly alleviate the damaging effects of natural disasters such as typhoons and storm surges on coastal ecology. Therefore, the world environmental protection organization has passed a resolution to prohibit logging. Shallow coral reefs protect the land area from intrusion.
Deep-sea corals, also known as precious corals, are generally corals that grow at water depths of 200 to 2,000 meters. Their distribution in the world has certain limitations. Since its petrification process is completed in the deep sea, coral jade has smaller pores, higher density (generally between 2.5 and 2.8), dense structure, and hardness ranging between 3 and 4. It is an ideal choice for various sculptures and artworks. The main raw material of jewelry and jewelry, so it is called precious coral. Since red coral is the most precious among deep-sea corals, red coral has become synonymous with precious corals.
Red coral can be divided into five categories according to different colors: dark red coral, pink coral, pink coral, pink and white coral, and white coral.
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