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. We hand carved and oxidized the channel where the diamond is set. The oxidation is protected within the channel and is therefore better preserved over time. We love how the diamond really pops against the oxidized channel. These stud earrings were designed in San Francisco and are handmade in our Upstate New York production studio.