Lot 406. 57.60 carats Ceylon step-cut sapphire and diamond brooch. Estimate 240,000 — 435,000 CHF (219,340 - 397,553 EUR). Photo Sotheby's

Set with a step-cut sapphire weighing 57.60 carats, within a frame of brilliant-cut, pear- and marquise-shaped diamonds, maker's mark. 

Accompanied by SSEF report no. 83393, stating that the sapphire is of Ceylon origin, with no indications of heating. 

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 17 May 2016, 10:00 AM