1 Carat Transitional Cut Diamond Engagement Ring Platinum1 Carat Transitional Cut Diamond Engagement Ring Platinum. This interesting Art Deco engagement ring features a dazzling 1. 01 carat transitional cut diamond and is set in platinum. The shoulders contain . 24 carats of accent diamonds of which are round cuts as well as baguettes. The center stone is set with fishtail prongs inside a square shaped element that separates it from the rest of the accent stones. The shoulders split and run toward the