Vintage 1930s Art Deco, estate purple amethyst oval, framed with marcasite stones, sterling silver pendant, on a 16" white gold filled chain. Bail is stamped STERLING. Pendant measures 1"L x 3/4"W, and weighs 5.7 grams. Chain necklace spring ring clasp is stamped 1/20 12 Kt G F, the fastener ring is stamped NS in a diamond shape hallmark, and it weighs 2 grams. Pre-owned. Missing one marcasite stone, on the left side. The necklace may not be original to the pendant. Thank you for looking.