This bar pin is a great example of Art Nouveau jewelry. The setting is made of some type of brass. It is prong set with a large rectangular faceted purple glass stone. It has a C-catch and a tube hinge. The entire pin measures 4 1/4" X 5/8". Just the stone measures 2" X 7/16". I There are some flea bites along the edges of the stone.
Art Nouveau Brass Large Purple Glass Stone Bar Pin