Thanks, so much. The bathtub surround and top is made from Authentic Durango Veracruz Honed and Filled marble limestone. You can see more of our Veracruz selection at this link http://durangostone.com/products/tiles/authentic-durango-veracruz/. We use a color matched Italian resin-fill because it never soils and takes the finish of the stone surface beautifully. We then triple hone the surface to close the microscopic pores where dirt can collect, which makes the tile more cleanable.