This is a wonderful vintage Art Deco chatelaine drop brooch in chrysoprase (also called chrysophase) and marcasite set in sterling silver. The brooch is hinged or articulated so that it moves. The bottom of the drop has a monogram of WW. The pin back fastens with a rollover safety catch. This pin dates to around the 1920s or 30s. It is unmarked but has been acid tested for sterling silver and the stones have been tested with a gemstone tester.
It measures about 2 1/2 inches by 1 inch and it is in very good condition with a couple of missing marcasites.