1.00 Marquise Cut Diamond & Sapphire Ring in Platinum1. 00 Marquise Cut Diamond Sapphire Ring in Platinum. This lovely engagement ring features 1. 12 carats of diamonds and . 64 carats of blue sapphires finished in shimmering platinum. The center stone is a 1. 00 carat marquise cut diamond. The center diamond has a soft warm hue and a classic marquise pointed oval shape. The bezel setting of the primary stones features a fine milgrain engravings. The center diamond is accented by sixteen (16) . 04 carat