1/2 Carat Total Wt Black Diamond Solitaire Engagement Ring Marquise Cut 14K Solid Gold Comfort Fit. This is a wonderful marquise cut black diamond engagement ring that is classic in design. Its timeless design ensures this solitaire engagement ring to be perfect as a family heirloom. At the center and focal point of this engagement ring is a glittering, marquise cut brilliant earth-mined diamond. Also available in 14K White Gold, 14K Yellow Gold and Rose Gold. The elegant setting is classical and doesn’t take away from the beauty of the diamond. It is slightly wide band with a comfort fit setting to give you a sturdy feeling.