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Lot 553. Highly important 39.00 carats Burmese 'royal blue' sapphire and diamond ringEstimate 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 diamond shoulders,size 52, sizing band.

Accompanied by SSEF report no. 64244 and Gübelin report no. 12110116, stating that the sapphire is of Burmese origin, with no indications of heating. The Gübelin report states that the colour variety of the sapphire may also be called 'royal blue' in the trade.

Sotheby's. Magnificent Jewels Geneva | 14 Nov 2012