Lot 79. An Exceptional Colombian Emerald and Diamond Ring, Tiffany & Co. Estimate 1,000,000 — 1,500,000 USD. Lot sold 1,455,000 USD. © Sotheby's. Centering an emerald-cut emerald weighing 12.03 carats, accented by two trapeze-cut diamonds, size 5½ , signed...

Lot 1678. Important 27.71 carats Burmese 'Royal Blue' Sapphire and Diamond Ring. Estimate 6,300,000 — 7,500,000 HKD . Photo: Sotheby's. Set with an octagonal sapphire weighing 27.71 carats, the mount decorated with circular-cut and baguette diamonds,...

Lot 553. Highly important 39.00 carats Burmese 'royal blue' sapphire and diamond ring. Estimate 300,000 — 400,000 CHF. Lot sold 2,770,500 CHF. Photo Sotheby's 2012 Set with a step-cut sapphire of superb colour weighing 39.00 carats, between triangular...