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Coral is the skeletal remains of a marine animal, the polyp corallicum, and is mainly composed of calcium carbonate. The most beneficial kind of coral is the noble pink, Corallicum rubrum. Since Corals are calcified skeletons of sea creatures, they grow in formations resembling the branches of a tree. Most coral used for jewellery comes from the Mediterranean Sea or from the Pacific Ocean close to Japan and Taiwan. Treasured gem corals are formed deep undersea. A particular characteristic of the valuable corals is that they take an ideal polish. In their natural state, corals have a tree-like appearance, which allows the maximum number of polyps to be fed by vitamins in the water surrounding the colony.

The coral is the massive calcareous stacks which secretes in the sea one sort of preliminary coelenterate coral polyp becomes by the expansion, assumes the dendritic, the cross section has the concentric layered pattern. Its chemical composition is the calcium carbonate, primarily seems by the calcite form, diploma of hardness is 3.5-four, the proportion is 2.60-2.70. Doesn't bear the acid and alkali.

Coral species, evaluation and purchase. Coral species have crimson coral (outside "the cow's blood," "Angel Face"), black coral, blue coral, Mediterranean coral, Japan, coral, coral Cameroon, China Hainan coral. The quality is sort of the same coral, coloration, and fragmentation is the basis for financial analysis and selection. Colored than the white high quality, lovely shade necessities, bright and pure. Fragmentation the better. The worth of coral additionally by the affect of the various local customs, such because the Arab choice for vivid pink, pink fashionable in Europe.

The conventional middle for the fashioning of coral is Torre del Greco, near Naples. It was Napoleon's Italian marketing campaign, with its related taste for all issues Italian that heralded the style for carved coral jewelery. The rose pink selection turned at the moment essentially the most sought after.

During the 1860's coral beads and ovoids were set into gold brooches, very like turquoise had been. Within the 1870's coral was combined in bloomed gold brooches with diamonds and emeralds.

Coral protection. Because the chemical composition of coral is CaCO3, chemically unstable, scorching summer time, when the physique sweat, sporting a coral necklace should not be a long time, due to sweat and acid secretion within the salt will corrode the coral. Coral shouldn't have more contact with Beauty, Perfume, Alcohol, salt, oil and vinegar. The structure of coral density, there is porosity, easily dirty, cleaning with a mild cleaning soap and water.