G684 black basalt is a kind of popular black basalt that quarried in China. The most beautiful smooth black basalt sink. Elegantly Handcrafted by Black Basalt First Class - This sink is made from the highest quality G684. Smooth interior and exterior. With its clean, modern lines and rising arches, this handcrafted Smooth Bowl Stone Sink still offers a modern, serene look while also providing plenty of depth for a frequently used bathroom or powder room. This sink has a polished finish for a rustic look.