Early Navajo Sterling Silver & Turquoise Earrings Pierced

Early Navajo sterling silver pierced earrings that are set with natural turquoise. One is blue and one is green. They were always different colors. Each stone is embellished with three raindrops. They were once screw backs and have been converted. Measures 1 3/8" long with the ear wires. Together they weigh 4.4 grams. Very tarnished. No hallmarks.