This tri-toned U necklace’s pendant piece measures 5.5/8″ x 1/8″. The chain length is adjustable and can be worn at 19.1/2″ or 21.0″ in length. Materials: 14k gold or rose gold-fill (14k gold over brass core/no nickel), sterling silver (.925) and oxidized 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 was designed in San Francisco and is handmade in our Upstate New York production studio.