Jul 25, 2010 8:10 AM
Octaha-wha? We never knew such a shape existed! We're talking about the Cube Octahedron Ring ($110). Barcelona-based jewelry designers Bandada created this geometric beauty in gold-plated sterling silver, as well as solid 18kt gold. Flash this baby and brag about your mathematical knowledge! Don't worry if you're not actually a math pro: just name-drop polyhedron, and you're set!