This is a lovely and feminine vintage Art Deco necklace with a green glass pendant. It is German in origin and the back of the pendant is marked Ges. Gesch which is the German patent or copyright mark. It features a silver colored metal mount and matching stations on either side flanked with faux pearls. It fastens with a slip type catch.
It is in lovely condition and it measures about 16 1/2 inches wearable length. The glass pendant is about 1 inch by 3/4 inch.