Coral jewelry is becoming a fashion and more people begin to love coral jewellry,which including coral necklace,coral bracelets,coral earrings,coral rings and so on.
The coral is the massive calcareous stacks which secretes in the sea one kind of preliminary coelenterate coral polyp becomes by the growth, assumes the dendritic, the cross section has the concentric layered pattern. Its chemical composition is the calcium carbonate, mainly appears by the calcite form, degree of hardness is 3.5-4, the proportion is 2.60-2.70. Does not bear the acid and alkali.
The coral mainly has red, white, green, purple and so on colors, take the color pure red coral as the high-grade goods.
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