Antique Engagement Ring Art Deco .83 Round Brilliant Cut Diamond in PlatinumThis original Art Deco engagement ring is finely crafted in bright white platinum. It features a . 83 carat round brilliant cut diamond fishtail prong set at its center. To each side are three bead set single cut diamonds with milgrain edge accents. It is wonderful example of the fineness and geometric qualities that the Art Deco period are known for.