Fine Diamond ring. photo courtesy Sotheby's Set with a step-cut diamond weighing 12.31 carats, between tapered baguette diamond shoulders, mounted in platinum, size 51. Est. 700,000—900,000 CHF. Lot sold 1,202,500 CHF . Accompanied by GIA report no. 2125388458...

Cut-cornered rectangular step-cut diamond ring Set with a cut-cornered rectangular step-cut diamond weighing 5.20 carats, the shoulders decorated with single-cut stones, mounted in platinum, size 47½. Accompanied by GIA report no. 10217839 stating that...