Carl Art Earrings – Signed Sterling Silver Onyx and Rhinestone Screw Back Vintage Earrings. These lovely earrings have a classic design. Each sterling silver screw-back earring . at the top. Each earring measures slightly over 1/2″ wide and 3/4″ from top to bottom. They are stamped sterling on the screw backs and also have the CA with an arrow going through the letters, which is the marking for Carl Art. They date from the 1960s. The setting is sterling silver but the rhinestones might be set in a silver tone metal. These earrings are in excellent vintage condition.