Tungsten Carbide Ring With Black Carbon Fiber Center. CleverEve's Tungsten Carbide rings are of the finest quality and designed with fashion and durability in mind. CleverEve's goal is to provide outstanding quality at everyday prices. CleverEve will exchange your ring free of charge should you need a different size. Tungsten Carbide has only recently been used in the fashioning of jewelry due to its hypoallergenic nature and the fact that due to its extreme hardness it is not apt to lose its luster like other polished metals. In fact, a ring made from Tungsten Carbide will never need polishing and it is virtually scratch proof. CleverEve is proud to introduce Tungsten Carbide rings to the mass market. Clever Eve's Tungsten Carbide Rings are rank next to Diamonds on the Mohs Scale. Designed to forever keep their shine. The flawless strength of Tungsten Carbide rings make for timeless wedding bands and fashionable unisex accessories.