This platinum antique diamond engagement ring is beautiful. This ring has a total diamond carat weight of 0.50 ct tw. This center old-mine diamond measures approximately 0.30ct tw. This center diamond is bordered by 20 side accent diamonds for an additional 0.20ct tw. This ring has an incredible amount of shine and radiance. This lovely ring weighs 2.5 grams. This ring is a size 6.5 and could be resized. This ring is in excellent estate condition and shows minimal signs of wear. Circa 1920s.