Celestial Geometry: A Sapphire and Diamond Ring by JANAThis extraordinary 18k white gold ring by JANA draws the eye inward, toward a 2. 11 carat sapphire of mesmerizing depthmidnight blue, steady as a planet in its orbit. The central gem is encircled by a radiating double halo of baguette and brilliant cut diamonds, their icy shimmer creating a luminous corona that recalls both Art Deco precision and cosmic mystery.