Here is a pair of round sterling and turquoise earrings. They have a Native American look to them but I can not say for sure. they measures 3/4" in diameter. The screw backs work well and are secure. The stone is loose on the one earring but it is in no danger of falling out. Stamped sterling on the end of the screw.
1940's Sterling Silver & Turquoise Screw Back Earrings