These rounded square studs are 3/8″ long by 3/8″ at their widest point. Materials: 14k gold-fill (14k gold over brass core/no nickel), 14k rose gold-fill, oxidized sterling silver and sterling silver (.925 ). There are four versions of these earrings. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. Click the drop-down menu to choose your desired metal combination. All materials are hypoallergenic. These earrings are handmade in our California and New York production studios. Please note: in both photographs, the model is wearing the studs in her second hole.