Vintage Mexico Silver Black Onyx Earrings Screwback. Shipped with USPS ground advantage. You will receive the exact pair of earrings pictured. They are pre-owned, however, in excellent condition! The earrings are marked Mexico silver. I'm not sure of the silver percentage. They are long earrings measuring 1.5 in long with screw back closure. Will be shipped very fast and safe. J2