Tungsten Ring Silver Inlay Men's Wedding Band Titanium Color Tungsten carbide is extremely hard and high resistance to scratching Tungsten carbide is roughly 10 times harder than 18k gold It is ranking ~9 on Mohs scale Tungsten carbide is approximately two times stiffer than steel Tungsten carbide has a high melting point at 2,870 C (5,200 F) Tungsten carbide rings are cobalt free