Vintage 1930s Art Deco Brass & Amethyst Glass Brooch - Intense UV Green Manganese GlowA spectacular statement piece from the interwar Art Deco era, this large 2. 75 inch brooch showcases the exceptional design and material science of early 20th century costume jewelry. At the center sits a massive, open back oval multi faceted art glass stone in a striking lavender amethyst hue, secured by a heavy, prominent four prong setting. This central jewel is framed by an ornate, heavily detailed repouss brass border cast with intricate floral