The tri-toned multi-rounded square loop pendant piece measures 5/8″ x 5/8″ at its widest point. The chain length is adjustable and can be worn as a 16.1/2″ or 18.0″ in length. Materials: 14k gold or rose gold-fill (14k gold over brass core/no nickel), sterling silver (.925) and 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 necklace is designed in San Francisco and handmade in our Upstate New York production studio.