This is an early brooch with a c-clasp in the back. The front is glass over a porcelain figure of three women dancing. They are laid over a blue textured glass that looks like sunbursts. When you look closely you can see what looks like mercury glass coming through the white porcelain figures. The brooch measures 1 1/8th inch wide.
Antique Sulfide Glass Brooch ~ Three Women Dancing ~ C-Clasp