1.59 Old Mine Cushion Diamond Engagement Ring 14kThis solitaire engagement ring features a 1. 59 carat old mine cushion cut diamond in 14 karat yellow gold. The fancy brown diamond has I1 clarity, giving it a warm cognac tone with visible inclusions that add natural character. Set in a split claw basket with four prongs, the square cushion cut maximizes the diamond's surface area and vintage inspired faceting. The ridged band measures 2. 4 mm wide and pairs well with the antique center stone.