8mm Tungsten Carbide Men's Wedding Band Ring Two Tone Black IP Plated Genuine Tungsten, Scratch Resistant, Comfort Fit, Hypoallergenic, Cobalt Free 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. Tungsten have been referred to as the "Permanently Polished Rings". "Scratch Resistant Rings"