These thick square black & gold rings are available in sizes 4.0 – 9.5, including all half sizes. Materials: oxidized silver (black) and 14k gold-fill (14k gold over a brass core/no nickel). The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. All materials are hypoallergenic. These rings are handmade in San Francisco, California.