.51 Emerald Cut Diamond and Sapphire Ring in Platinum. 51 Emerald Cut Diamond and Sapphire Ring in Platinum. This stunning modern ring features . 73 carats of diamonds and . 98 carats of blue sapphires finished in shimmering platinum. The center stone is a . 51 carat emerald cut diamond. Near colorless and dazzling with dimensional, elongated facets, the center diamond is flanked by two (2) . 49 carat blue sapphires. The dark blue hue of the sapphires create a striking contrast to the bright diamonds.