Whereas many building materials become unsightly over the course of many years, natural stone retains a natural patina, which is not detrimental to its beauty. Many natural stones are like good wine: they only attain their full elegance with advancing years. Natural stone can also be cleaned easily and inexpensively. Even centuries- old floor coverings of natural stone can be resurfaced, polished and restored to their original condition with the expertise of Marble Renewal®. The lifetime of natural stone is extremely long. With the right planning and construction, buildings and natural stone have been known to survive for many thousands of years.