This individual tri-toned stria stud earring is sold individually, and measures 1/2″ by 1/16″ at its widest point. Materials: 14k gold-fill (14k gold over brass core/no nickel), sterling silver (.925), and oxidized sterling silver. All materials are hypoallergenic. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. This earring is designed in San Francisco and handmade in our Upstate New York production studio.