8mm Tungsten Carbide Ring with Blue Sapphire .050 Carat Stone & Blue Carbon Fiber Inlay Wedding Band (12) This beautiful Tungsten carbide ring is 8MM in width and comfort fit. It is all high polish with beveled edges and has Blue Carbon Fiber inlay center It also has a burnish set .050 Carat Blue Sapphire . which gives it that unique exquisite appearance.