Bamboo coral, is naturally creamy white or gray, made up of calcium carbonate in the form of tree-like branches alternating with joint-like nodes. When bamboo coral is dyed red to mimic the more precious red coral, it can be difficult to distinguish between the two. It is named "bamboo" because its skeleton is made up of deeply calcified gorgonin -- or horny – nodes. Red-dyed bamboo coral has replaced red coral in jewelry design due to red coral's depletion. Bamboo coral is either dipped in red dye or injected with dye to saturate it throughout. The dyeing process happens just after the bamboo coral has been hand cut into the desired shape -- usually a bead -- and is sanded. Once dyed, the coral bead is then coated with a resin base and polished to achieve the high gloss finish found in jewelry. Because bamboo coral is naturally soft and porous, keep your coral jewelry away from perfumes and hairsprays to avoid damage.