These J post earrings are 3/8″ long by 3/8″ at their widest point. Materials: 14k yellow or rose gold-fill (14k gold over brass core/no nickel), sterling silver (.925) and oxidized sterling silver (.925). Click the drop-down menu to choose your desired metal combination. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. All materials are hypoallergenic. These earrings are handmade in our California and New York production studios.