These are lovely, probably circa 1930's-40's, screw-back Native American Navaho Concho earrings. Beautiful, traditional style with raised beading on outside rim surrounding an inner rope-pattern having a center raised dome. They are approx, 3/4" in diameter and weigh 4.8gr. Only one screw-back is stamped "STERLING". They are in excellent vintage condition, unpolished and ready to wear or add to your collection. Thank you for looking!