This stria stud earring is sold individually, and measures 3/8″ in length. Materials: 14k gold-fill (14k gold over brass core/no nickel), sterling silver (.925) or 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 Upstate New York.