The mini square stud earrings measure 3/8" by 3/8" at their widest point and the square hoop earrings measure 1.7/8″ long by 2.0″ at their widest point. Materials: 14k gold or rose gold-fill (14k gold over brass core/no nickel), sterling silver (.925), or oxidized sterling silver. 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 are designed in San Francisco and handmade in our Upstate New York production studio.