Coral is symbolism for Mars. It is one of the stone in nine stones call as navaratna symbolism for nine planets call as nava graha. Mars is the Mark of Brave. He is man with a weapon.It is symbolism for Fire . This Coral wearing is very good to get Brave. Best to wearing those people who born in Mesha(Aries) & Vruchika(Scorpio) Rasis and who born in Stars Mrugasira, Chitta , Dhanishta. Better to take a suggestion from Astrologer.

Coral Coral is a limestone formation formed in the sea by millions of tiny animals. Coral formations may look like branching trees, large domes, small irregular crusts, or even like tiny organ pipes. The living coral-forming animals colour the formation in beautiful shades of tan, orange, yellow, purple, and green. When the animals die, they leave limestone "skeletons" that form the foundations of barriers and ridges in the sea called coral reefs. Many colourful sea animals live among the corals. These animals include fishes, starfish, and sea anemones. Sometimes coral masses build up until they rise above the water to form coral islands. The grinding, battering sea helps to build coral islands. It breaks up the coral growths and piles them up. Other creatures, such as calcifying algae, cement the pieces together and a rigid structure is formed. Often, soil lodges on the coral and vegetation begins to grow. Many islands in the Pacific Ocean were formed this way. Precious corals live in colder waters. Certain corals grow as far north as the Arctic Circle. Destruction of coral reefs. Coral reefs are unique because they are so rich in animal life and because they take many hundreds of years to develop. In many places round the world, however, the reefs are being destroyed. The destruction occurs in a number of ways: the reefs are mined for building materials; they become buried in silt that runs off eroded hillsides; and they are polluted by sewage that is pumped out to sea. In addition, fishermen blow up coral reefs to catch fish, which they sell either for food or as aquarium fish. Coral reefs are also broken up so that pieces can be sold to tourists as souvenirs. Global warming is causing the sea temperatures to rise and this is also killing the reefs. Coral reefs are found mostly in warm, shallow, and tropical seas, because the reef-forming corals cannot live in water colder than 18 °C. Reefs abound throughout the South Pacific, in the East Indies and the Indian Ocean to Sri Lanka, and around Madagascar on the southeastern African coast. They also form along the tropical eastern coast of Brazil, through the West Indies, along the Florida coast, and at Bermuda. There are three types of coral reefs: (1) fringing reefs; (2) barrier reefs; and (3) atolls. Fringing reefs are submerged platforms of living coral animals. These reefs extend from the shore into the sea. Barrier reefs follow the shoreline, but are separated from it by water. They form a barrier between the water near the shore and the open sea. A barrier reef may consist of a long series of reefs separated by channels of open water. Such reefs usually surround volcanic islands of the South Pacific. The Great Barrier Reef of Australia, about 2,010 kilometres long, is the largest coral reef in the world. An atoll is a ring-shaped coral island in the open sea. It forms when coral builds up on a submerged mudbank or on the rim of the crater of a sunken volcano. The atoll surrounds a body of water called a lagoon. One or more channels connect the lagoon to the open sea. Many coral islands of the South Pacific Ocean are atolls. How coral is formed. The animals that form coral belong to the same animal group as the hydras, jellyfish, and sea anemones. Most individual coral animals, called polyps, are less than 2.5 centimetres in diameter, but a small percentage of them measure as much as 30 centimetres in diameter. A coral polyp has a cylinder-shaped body. At one end is a mouth surrounded by tiny tentacles. The other end attaches to hard surfaces on the sea bottom. Most coral polyps live together in colonies. The stony corals attach themselves to each other with a flat sheet of tissue that connects to the middle of each body. Half of the coral polyp extends above the sheet and half below. Coral polyps build their limestone skeletons by taking calcium out of the seawater. Then they deposit calcium carbonate (limestone) around the lower half of the body. As new polyps grow, the limestone formation becomes larger and larger. Coral polyps feed mainly on tiny swimming animals, such as the larvae (young) of many kinds of shellfish. Reef corals cannot live without algae. They use some food manufactured by algae that live in the polyps' own tissues. These algae produce chemicals that help the coral animals secrete their limestone skeletons. Coral reefs grow only in water with enough light for photosynthesis to occur in the algae. Coral polyps reproduce either from eggs or by budding. Small, knoblike growths called buds appear on the body of an adult polyp, or on the connecting sheet, from time to time. These buds grow larger, separate from the parent, and then begin to deposit their own limestone in the colony. Budding thus helps the colony increase its size. New colonies of coral polyps form when the adult polyps of an old colony produce eggs. The eggs grow into tiny forms that swim away. Then the developing animals settle to the sea bottom and begin to form new colonies by budding. Various marine animals eat living coral-forming animals. The loss of coral to such animals is usually balanced by the development of new coral colonies and the growth of old ones. But beginning in the 1960's, large numbers of crown-of-thorns starfish destroyed stony coral colonies on many reefs of the southwest Pacific Ocean. Scientists are trying to determine what could have caused this species of starfish to become so numerous. Precious and gorgonian corals. Other kinds of coral, in addition to stony corals, are found in the world's oceans. These corals are also colonies of polyps, but the skeletons they form are internal rather than external. Precious coral is a species (kind) valued for jewellery. It has a hard core (internal skeleton) that can be polished. Polishing brings out beautiful red, rose, or pink colours. Craftworkers carve it into beads and other ornaments. Precious coral grows in bushlike formations in the Mediterranean Sea and Sea of Japan. Gorgonian corals have internal skeletons of a flexible, horny substance. These corals look like bushes, fans, or whips. They may be soft yellow, rose, purple, brown, tan, or black. In clear West Indian waters, gorgonian corals look like sea gardens as they wave on the reefs. Scientific classification. Corals are in the phylum Cnidaria, class Anthozoa.