The Aviation Set is a mixed shape stack set available with or without oxidation. It is made up of five rings including two 2.5mm wide gold square, one 3mm wide silver round, one thin (1mm wide) silver or oxidized silver round, and one thin (1mm wide) gold round band. 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-fill (14k gold over a brass core/no nickel), sterling silver (.925), oxidized (blackened) sterling silver, and a 1.5mm lab-created diamond. All materials are hypoallergenic. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. This original stack creation was featured during the Ring Bar Happy Hour on IG Stories, and is handmade in our Upstate New York production studio.