.67 Mid-Century Diamond Engagement Ring in 14k White Gold. 67 Mid Century Diamond Engagement Ring in 14k White Gold. This sleek Mid Century engagement ring features . 77 carats of diamonds finished in 14 karat white gold. The center stone is a . 67 carat Old European cut diamond. The glittering primary stone is near colorless and set in four prongs. Two (2) . 05 carat accent diamonds flank the center stone and are set in unique channel bars. The diamonds are finished in polished 14k white gold. The fire