This 4-stack four generations square ring set is made up of four rings including 2 thick sterling silver square rings (one with 1.0mm diamonds, the other without), 1 thick (6mm) square sterling silver ring with a 1.5mm diamond in an oxidized "channel," and 1 thick 14k gold square band. This stack is available in sizes 5.0-9.5, including half sizes. Special note: Because of the width of our stack ring sets, it is recommended to buy a stack that is approximately a half to a full size larger than your normal ring size. Materials: 14k gold, sterling silver (.925), oxidized sterling silver, and lab-created diamonds. All materials are hypoallergenic. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. This ring set is designed in San Francisco and handmade in our Upstate New York production studio. Please note: Special Occasion items don't qualify for discount -- but you can use CMD BUCKS on them!