Wedding Ring/band Tungsten Carbide & Red /Black Carbon Fiber Inlay in 8mm -Available in Sizes 7-15 Tungsten rings are scratch resistant . Tungsten is about 10 times harder than 18K Gold, 5 times harder than tool steel, and 4 times harder than titanium. Tungsten measures between 8 and 9 on the Mohs hardness scale. Due to their extreme hardness, Tungsten Rings will hold their shape and shine longer than most rings on the market. Tungsten have been referred to as the "Permanently Polished Rings". Scratch Resistant Rings