Vintage Art Deco Purple Gem Clip On Earrings Add a touch of vintage elegance to your collection with this Vintage Art Deco Purple Gem Brooch featuring a ;arge center amethyst colored gemston and a spray of green rhinestones in an art deco setting. The center amethyst gemstone is \emerald cut. The brooch measures 2' x 2' This piece is from an estate and in excellent condition.