These black and white channel rectangular stud earrings measure 3mm by 9mm at their widest point. Each earring features a 1.5mm 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.