The Siena Silver travertine comes from Italy and is a walnut brown travertine. Its texture typically shows a "cloudy" morphology with light and darker areas of the same background color tone. It shows frequently very small white or grey patches due to natural fossil shells or iron inclusions. In its natural form has “holes”, “pores” and “fissures” that are filled and sealed with transparent resins and small metal silver foils blended with reflective crystals that produce the sparkling effect of a precious stone. Consequently the surface is not regular due to the presence of residual micro-holes/pores that determine the natural characteristic of the travertine itself.