Coral is an organic gemstone which is cut from a mass of skeletons, secreted by polyps as a calcareous habitat. These corals, usually, grow at a depth of no more than about 50 feet (15 to 20 meters) in tropical to sub-tropical waters in a belt between 30 degrees above and below the equator. It comes in a wide variety of colors which are caused by both the water temperature, the food and the level of pollution. The highest valued corals are those with a dark red (ox blood) or pinkish (peau d'ange) color. Corals are usually cut as beads or en cabochon. The larger the stones and the more even the color distribution, the higher the price will be. Cameos and sculptures were also carved from this gem. There is an emphases on were as most coral reefs are now, rightfully, protected globally due to their invaluable ecological role. Much like the trade in ivory, the trade in old coral is still acceptable and many coral artifacts are of historic value.
In Chinese cultures coral was credited as prolonging life expectancy and official promotion, while in ancient Greece coral had the attribute of counteracting evil spells, storms, poisons and robbery. The Navajo Indians considered coral as one of the 18 sacred object and many native American jewelry and objects are decorated with this gem.
Red is the color of passion and red coral is a symbol of love and prosperity. It induces creativity, optimism and inner peace. In a metaphysical sense it is used for healing with the concentration on the circulatory system.
The Italian town Torre del Greco at the foot of mount Vesuvius - the volcano that buried Pompeii and Herculaneum - has for centuries been the main center of coral trade and coral cutting.
|Gemological information for coral|
|Color||Red, orange, pink, peach, black, brown, gold|
|Crystal Structure||Amorphous (organic)|
|Durability||Soft and fragile|
|Similar stones||Coral may be mimicked by glass, plastics and ceramics|
|Country of origin||Generally between the 30 degrees below and above the equator topical to sub-tropical waters|
|Ultrasonic cleaning||Not safe|
|Steam cleaning||Not safe|
|Warm soapy water||Not safe, use a damp cloth|
|Chemical attack||Not safe|
|Heat sensitivity||Not safe|