Vintage Purple and Rhinestone Broken Brooch, 1920s, Filigree Brass, 1-1/2 inch

ERA: True vintage item from the 1920s, maybe older
MEASUREMENTS: 1-1/2 inches across
MATERIAL: glass, brass?
LABEL: unmarked
Clear purple glass stones with clear rhinestones set in metal that I believe to be brass. Fancy filigree design.
CONDITION: Good condition. The metal has some tarnish and the glass stones have some super lite wear. The pin is broken off of the back.