A deep and mesmerizing 4.18-carat cushion-cut royal blue sapphire glows front and center in this impeccably-styled halo engagement ring; 16 round brilliant cut white diamonds are shared-prong-set around the center, creating a whimsical and very feminine-looking scalloped halo, while slightly smaller rounds are U-pave set down the voluptuous split shank (the shank design we borrowed from our Silhouette Collection styles, inspired by the natural curves of a woman's body); from Uneek's Royal Blue Collection .