This diamond bullet stud earring is sold individually, and measures 2mm by 2mm at its widest point. This single earring comes in 14k gold or sterling silver and features a 1.5mm diamond. Materials: 14k solid gold or sterling silver (.925) and a lab-created diamond. All materials are hypoallergenic. This earring is designed in San Francisco and handmade in our Upstate New York production studio.