Mid-Century Marquise Diamond Cocktail Ring in 14k Yellow GoldMid Century Marquise Diamond Cocktail Ring in 14k Yellow Gold. This Mid Century cocktail ring features 1. 23 carats of marquise cut diamonds finished in 14 karat yellow gold. Set in distinct golden prongs, a tapered row of near colorless diamonds decorate the front of the band. The center diamond is a . 36 carat marquise cut gem. Followed by two (2) . 18 carat diamonds, two (2) . 14 carat diamonds, two (2) . 10 carat diamonds, and two (2) . 07 carat