The Silver Plate is showing the effects of much oxidation, with the coppery tarnishing giving way to a most attractive patina on the front. The back side displays more of a mottled appearance from the oxidation. A molded plastic, to imitate Ivory, flower is prong set and has a leaf overlay. All together this is a most distinctive brooch. It measures a full 3 1/4 inches x 3/4". C-clasp. Ca., 1940's and wears very well!