Silver Travertine Natural Stone tiles are cut from a solid piece of earth that has been formed by the deposition of calcium carbonate br springs and rivers is a beautiful and unique colour of travertine. Its bold shading and banding is caused by a mixture of iron and organic compounds. Silver Travertine tiles are very much on tred. Being natural stone, Silver Travertine tiles are all different with two tiles never being the same. Colour may vary.