Classic brooch, pearl, black, gold-tone pin

EUC. This Victorian-looking pin is not marked, but it looks similar to the 1928 jewelry brand style. The pin itself is not attracted by a magnet, which indicates this may be gold-plated silver, but I'm not positive. The pin clasp in the back does stick to a magnet and is in fine working order. The width is approx. 1 1/2 inches. The colors are gold, black, and pearly white.