Vintage Black Onyx Sterling Silver Screw Back Earrings ACE Guadalajara Mexico

Vintage 1940s black onyx and sterling silver screw back earrings. Triangular cone shaped onyx stone bezel set in sterling silver with granulated detail on the point and along the curve. Screwback clip on closure. Maker's mark stamp on back on one earring reads "ACE, Hecho en Mexico, Guadalajara, 925." Highly collectible and a rare piece of vintage Mexican jewelry. 0.8" length and 0.75" width. Gently used Needs cleaning 8 grams