Coral stone, popularly known as Moonga Ratan in Hindi, is a prominent member of the Navratna family. Unlike other colored gemstones, it is a marine product. Natural Red coral is the most renowned form of coral. Explore here a wide range of Red Coral Gemstone Online. Explore the widest range of 100% natural healing crystals at Navratan, the online gem Bazar along with a certificate of authenticity from the world’s renowned gemstones testing laboratories such as GIS, GRS, IGI, Gubelin, and C.Dunaigre.