Tungsten Carbide Clearance Light Fashion Ring with Turquoise Texture Inlay - 7-13 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