Antique Engagement Ring Art Deco .23 Old European Cut Diamond in 18k White GoldThis original Art Deco engagement ring has a sparkling . 23 carat Old European cut diamond at its center. The diamond is surrounded by a decorative outer bezel with layers of milgrain detail that give the setting depth. The 18k white gold mounting has a stripe of striated metal running down the shoulders of the ring. Above and below the striated stripe there are elegant openwork scrolls with milgrain edges.