Art Deco Black Opal Ring Platinum Diamond Estate JewelryA gorgeous Art Deco black opal ring, made of platinum and featuring diamonds. The opal displays a harlequin pattern, with vibrant patches of green and blue shifting across the gemstone. The opal is set in a bezel setting with four wide prongs and framed by a halo of old European and single cut diamonds. On two (east west) prongs there are baguette cut diamonds that are set horizontally. The platinum band is slender and slightly tapers towards the