Antique Art Nouvea Floral 1.40 C Old Mine Cushion Cut Diamond 18K Gold Mens Ring. This is an amazing art nouvea ring c.1910 with detailed high relief scroll work of flowers. The ring is marked 18k. The center diamond is a chunky old mine cushion cut that measures 1.40 carats. The diamond faces up eye clean I Color SI-1 clarity. The diamond measures 7.5mm by 6.5mm. The ring is in great condition, Ring Size 9 1/4, Weight 14.2 grams, ring measures 11mm wide.