When do tranquility and strength work together in harmony? Only with the Zen Large Granite Rectangular Vessel Bathroom Sink in black granite. This version of their popular sink is polished on the interior and chiseled on the exterior. 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. The free-flowing lines of this sink will provide your bathroom with a Zen-like feeling you can usually only find at your favorite spa. They recommend that you also purchase a drain with your stone sink in the same finish as your faucet.