5%- 10%。 Xiamen 999 Golden Diamond Jewelry Company can enjoy preferential treatment when buying red coral, depending on what red coral products are purchased, such as original branches of red coral, which can enjoy 5%- 10% discount, red coral bracelets with less discount can enjoy about 8% discount, and red coral rings or pendants can enjoy about 9% discount, so the red coral of Xiamen 999 Golden Diamond Jewelry Company can enjoy 5%-/kloc. When buying red coral, the color should be even, the color should be bright red, the redder the more precious, the third kind is more important, and the heavier the better. The chemical composition of red coral is mainly calcium carbonate, which is actually organic matter and water, as well as iron oxide, silicon and manganese. With naked eye or magnifying glass, concentric circles and radial fine lines can be seen on the cross section of coral, and a series of parallel longitudinal lines can be seen on the surface of coral, which is formed during the growth of coral, especially red coral.