These black onyx dangle earrings in sterling silver are part of the maker’s Wachenheimer Real Stone Jewelry line, launched in the late-1920s. They feature a faceted, square stone set with a top border of marcasites and suspended from a marcasite-encrusted slim sterling bar. A square-cut, prong-set onyx sits at the earlobe. These all-original screw-back earrings can be modified for pierced ears. This pair in the “Geometric” pattern was advertised in the November 9, 1929 issue of Vogue. Scroll down to see a selection of onyx Art Deco pieces to wear with these versatile and stylish jewels.