.85 Old European Cut Diamond Engagement Ring in Platinum. 85 Old European Cut Diamond Engagement Ring in Platinum. This engagement ring features a center, . 85 carat old European cut diamond, accented by complimentary diamonds. A halo of diamonds surrounds the primary stone, punctuated by two step cut diamonds at both lateral sides of the main gemstone. The shoulders, too, have dainty diamonds inlaid into the platinum band. From the silhouette, the gallery view includes swirls of crafted platinum so that