Vintage 925 Silver & Turquoise Locket Necklace

Hi up for sale one 925 Sliver locket with center turquoise stone. This has great patina on the silver. The stone needs polished, some scratches on waxed surface. Locket is stamped 925, opens and stays shut, lobster claw clasp works fine and is secure. I see no 925 stamps on the chain. This looks to me like spider web turquoise, which is very valuable. Questions Welcomed. Thanks