Tungsten carbide also called cemented carbide,  has become a popular material in the bridal jewelry industry due to its extreme hardness and high resistance to scratching. The mirror polish make it more charming and sometimes we set diamond onto it to make it much better.  Tungsten products should last for a lifetime.It is much harder and hence a best choice as a life time ring, and more important you can avoid this by purchasing our products which don't contain cobalt.