These black and white sunken diamond stud earrings measure 4mm by 3mm at their widest point. Each earring features a 2.0mm diamond in a sunken, blackened (oxidized) channel. 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 stud earrings are designed in San Francisco and handmade in our Upstate New York production studio.