This individual black and gold stria stud earring is sold individually, and measures 3/8″ long by 1/16″ at its widest point. Materials: 14k gold-fill (14k gold over brass core/no nickel) and oxidized sterling silver (.925). 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.