The Fuji Gold Cermet is a solid gold ceramic ring (not plated), providing the world with the first non-corrosive gold finish. Featuring both the hardness of ceramic and the toughness of metal (ceramic+metal=cermet), this ring is extremely strong. As a matter of fact, it's two times stronger than the SiC ring. Because of the strength of the combination of materials, the Gold Cermet ring is also lighter and thinner. And this ring is diamond polished to create a mirror finish, so it's super smooth - twice as smooth as the SiC ring.