3.60 Carat European Cut Diamond Engagement Ring Platinum3. 60 Carat European Cut Diamond Engagement Ring Platinum. This stunning Art Deco engagement ring features an amazing GIA certified 3. 60 carat Old European cut diamond and is set in platinum. The shoulders contain . 04 carats of small round accent diamonds which are set in line and surrounded by milgrain detail. There is also skillful engraving done along the side of the basket and at the bottom of the string of accent stones. This is one of the