These rectangle stud earrings are 5/8″ by 3/8″ at their widest point. Materials: Sterling silver (.925). 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 handmade in our Upstate New York production studio. Please note: Metal Madness sale items don't qualify for discount -- but you can use CMD BUCKS on them! All sales are final.