Rolex company for watches developed and patented in recent years the Cerachrom bezel for specific Professional models for its watches to ensure lasting beauty and functionality even after exposure to the most high extreme conditions. Fashioned from extremely hard ceramic material,Its diamond‑polished surface presents an exceptional luster. it is virtually impervious to scratches, and its color is unaffected by ultraviolet rays. The engraved graduations are coated with a thin layer of gold or platinum.