1 Carat Deco Diamond Engagement Ring in Platinum.  This Art Deco engagement ring features a 1.05 carat GIA certified Old European cut diamond set in platinum. The primary stone is set with four (4) flat prongs just slightly above a split shank. From the side profile this ring has a very gentle rise, melding the accent diamonds together for a larger diamond look. The open spaces where the shank splits are just enough to add intrigue, but your eyes will be focused on the wonderful diamond.