2.25 Transitional Cut Diamond Engagement Ring in Platinum2. 25 Transitional Cut Diamond Engagement Ring in Platinum. This modern engagement ring features 3. 29 carats of diamonds and . 49 carats of French cut emeralds finished in platinum. The center stone is a 2. 25 carat transitional cut diamond. Taking inspiration and evolving from the styles of Old European cut diamonds, the center diamonds facets are cut to sparkle and glitter. The center diamond is bezel set and has a soft champagne hue. A halo of