Vintage Deco open back rectangular crystal necklace. This vintage estate necklace. is a wonderful length at 30.5''. The silver toned metal is not marked and I have not tested it for silver content. It's rectangular faceted crystals are bezel set with open backs and measure app. 7mm x 8mm. They are each slightly unique in size and have the occasional chip and flea bite. This vintage necklace is a very hard to find length. It exhibits the quality and beauty expected in a vintage piece.