The color is the first thing you notice. A magnificent 15.63-carat turquoise cabochon—cool, vivid, and saturated with the kind of sky-blue that collectors spend decades searching for—rises from a luxurious pavé diamond dome of 18-karat white gold, her smooth surface framed by nearly 1.50 carats of sparkling white diamonds that radiate outward like a halo of light. Sleeping Beauty turquoise of this size, quality, and saturation is rare, the mine having been closed in 2012. A pure, robin's egg blue with minimal veining, this treasure has been coveted since the ancient Egyptians adorned their pharaohs with it. You will love wearing this ring on your hand.