These black and white line and disc stud earrings measure 9mm by 9mm at their widest point. Each earring features a sunken, blackened (oxidized) line and a 1.5mm diamond. Materials: Sterling silver (.925), oxidized sterling silver and lab-created diamonds. All materials are hypoallergenic. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. These earrings were designed in San Francisco and are handmade in our Upstate New York production studio.