1 Carat European Cut Diamond Art Deco Engagement Ring1 Carat European Cut Diamond Art Deco Engagement Ring. This Art Deco engagement ring features a 1. 16 carat Old European cut diamond that is finished in platinum. The accent diamonds on the shoulders are slightly raised off the band and are surrounded by a rectangle of milgrain detail. The center stone is set with four (4) rather thick prongs that give some more nice platinum color to the front face and enhances the whiteness of the stone. This will