Pretty cameo pin, 1 1/4" in diameter. It has a white glass cameo profile on a black glass oval. The central medallion is ringed by costume pearl beads and set in an antiqued gold-tone filigree back.
The reverse has a rolling ring clasp and a bale so it can be worn as a necklace, as well as a brooch.
The black glass has a bit or residue, which I think is excess glue. I have tried to show this by taking photos at an angle. The pin is in otherwise very good condition.