Antique Engagement Ring Art Deco .44 Old European Cut Diamond in PlatinumThis antique Art Deco Era engagement ring dons a . 44 carat Olde European Cut diamond set in four prongs and has a boarder of gold around it giving it a square look. In fact, the square look of the center this ring adds to the over geometric look of this ring which has a step down pattern to it, with another . 15 cttw. of diamonds prong set into the ring.