Lot 503. 6.68 carats Burmese ruby and diamond ring. Estimate 140,000 — 230,000 CHF. Lot sold 236,500 CHF. Photo: Sotheby's 2012 Claw-set with a step-cut ruby weighing 6.68 carats, the mount set with brilliant-cut and baguette diamonds, size 57. Accomanied...

Attractive ruby and diamond ring. Photo: Sotheby's. Set at the centre with a step-cut ruby weighing 12.02 carats, between triangular diamonds, size 53, sizing band. Estimation 460,000-730,000 CHF. Lot 668 vendu: 938,500 CHF Accompanied by Gübelin report...