Which Stone Is Most Precious Stone, Red Coral or Pink Coral?
Red coral gemstone is composed of Calcium carbonate, Red coral gemstone are found under deep sea water tropical and sub tropical area. These are mainly used in jewelry. Coral found in Mediterranean sea, like red sea, Midway islands, the canary islands etc. Red coral gemstone are fragile in nature, hardness vary from 3 to 4 on Mohs scale. for further information @ http://coral.org.in/stone-precious-stone-red-coral-pink-coral/