1.85 Carat Old-European Cut Diamond Buttercup Setting Platinum RingLadies beautiful platinum buttercup illusion setting vintage Edwardian era ring featuring an Old European cut diamond weighing approximately 1. 85 carat of (SI) in clarity and (I J) in color. Also features (2) single cut diamonds on either side weighing approximately 0. 05 carat total weight. Circa 1915 (+ ). Currently a size 6 3 4 but can be resized.