Retro Old European Cut Diamond Ring PlatinumRetro Old European Cut Diamond Ring Platinum. This retro diamond cocktail ring features 1. 52 carats of diamonds in a very unique design. The ring is set in platinum and features two (2) . 40 carat Old European Cut diamonds that are bezel set in the center, and are surrounded by a diamond halo that splits in a wedge over the shoulders of the ring. This symmetrical design is quite pleasing to the eye and provides an exciting take on a classic design!