Vintage Art-deco Brooch Black Onyx & White Crystal

Goldtone circle with two layers of round white rhinestones, topped off with a black lacquer- looking (probably a glossy Black Onyx) flat top and a prong set rhinestone in the center. No stamping, no Hallmark. This was originally sold back in the '60s with the matching screw-on earrings, I don't have those, though. Very nice piece, in excellent condition.