The Portola disc pendant is adjustable and measures 18.0" to 19.1/2" in length. The pendant piece measures 3/8" in diameter and features a 1.5mm diamond. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. Materials: Sterling silver (.925), oxidized sterling silver and one 1.5mm lab-created diamond. All materials are hypoallergenic. This necklace is handmade in our Upstate New York production studio.