The King's Ring, from Dark Souls 2. Said to let the wearer traverse paths others cannot.
This is a redesign of the King's Ring, based on the King's Gate that the ring opens. The original design simply doesn't translate well to a 3D ring. If you'd still like to purchase the original design, you can find it here:
Old King's Ring
Other sizes available on request. Prices may slightly vary with larger ring sizes, to account for the material cost.