The Granite Rough Exterior Circular Vessel Bathroom Sink is made from natural black granite stone. This beautiful stone granite sink is designed like yin and yang featuring a natural chiseled rough exterior with a smooth as silk polished interior. These 2 stone surfaces give the stone granite sink a level of depth that your typical bathroom sink just cannot replicate. The rough exterior of this stone sink provides a rustic rough and natural look while the polished interior provides a functional and beautiful stone sink surface. They recommend that you also purchase a drain with your stone sink in the same finish of your faucet.