ge Luigi Briglia Art Deco Statement Brooch

From my collection. An unusual vintage large art deco revival brooch. I need to measure but I’d say about 4” long. Will update shortly. I’m not sure what the center piece is made of. It has an iridescent glaze to it. The metal portion has an unusual antiqued metallic hue to it. OOAK. Hallmarked Briglia. His pieces usually run around $100-150