2.04 No Heat Cushion Sapphire Engagement Ring 14kThis three stone engagement ring features a 2. 04 carat cushion cut sapphire and . 47 carats of trapezoid diamonds in 14 karat yellow gold. The center sapphire displays a rare greenish blue hue and is GIA certified with no heat treatment, meaning its color is completely natural. Set in prongs, the cushion cut sapphire shows rounded corners and brilliant faceting that maximizes the stone's color depth. Two trapezoid diamonds flank the center stone,