Corall

Sponge coral is this stones trade name and really has nothing to do with sponges. It just looks like a sponge.Unlike most other gem corals, the sponge coral polyp homes rarely grow shut, and these open vacant homes are what have given the sponge coral its name. Because the structure is full of holes, 95% of all sponge coral is stabilized. Found mainly in the South China Sea, from Taiwan down to Indonesia,