4.55 Old European Cut Diamond Cocktail Ring in Platinum. Brighten up any outfit with this 4.55 carat old European cut diamond cocktail ring in platinum! The center diamond is a GIA-certified 1.86 carat OEC diamond with a soft warm hue. One (1) 1.31 carat and one (1) 1.38 carat diamond accent the center stone. This dazzling three stone ring has geometric mounting details and a unique, filigree crown basket to be admired from the gallery view. Finished in polished platinum, this ring is highly brilliant and full of life!