These stria stud earrings measure 3/8″ in length. Materials: 14k gold or rose 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. These earrings are designed in San Francisco and handmade in Upstate New York.