AN ART DECO EMERALD AND DIAMOND RING, BY TIFFANY & CO.   Centering upon a rectangular-cut emerald, flanked on either side by baguette-cut diamonds, mounted in platinum, circa 1920  Signed Tiffany & Co. (=) Ring Vintage, Wedding Rings Vintage, Vintage Jewellery, Antique Jewelry, Jewellery Shops, Fashion Jewellery, Antique Art, Vintage Art, Bijoux Art Deco