Wonderful 1920's platinum brooch with diamonds, onyx, and pearls. This lovely brooch measures 2 1/2" long and 1/2" wide (at center). There are (32) prong set Old Mine Cut diamonds set into a pierced platinum deco setting. The center of the brooch consists of two round cabochon onyx measuring 5mm each, and two round white natural pearls measuring 6mm each. Trombone clasp. Indistinguishable punch marks on stem. Comes in it's original box! Excellent condition. Circa 1920.