1 Carat Art Deco Engagement Ring w/ Old European Cut Diamond1 Carat Art Deco Engagement Ring w Old European Cut Diamond. This Art Deco engagement ring features a 1. 08 carat Old European cut diamond with . 30 carats of accent stones and is set in platinum. The borders around each section of diamonds overlap each other in a way that creates a nice implied motion and leaves plenty of negative space in and around the shoulders. This ring has nice soft features on all of the settings and shows a quintessential Art