Lot 410. Impressive 71.46 carats Burmese sapphire and diamond ring. Estimate 580,000 — 865,000 CHF (530,071 - 790,537 EUR). Photo Sotheby's

Set with a step-cut sapphire weighing 71.46 carats, between similarly cut diamond shoulders, size 53.

Accompanied by SSEF report no. 82733 and Gübelin report no. 16030072, each stating that the sapphire is of Burmese origin, with no indications of heating; the SSEF report together with an appendix letter.  

"The described gemstone exhibits an impressive size and weight of 71.467 ct combined with an attractive colour and an outstanding purity. Its colour is further pronounced by its well-proportioned cutting style, resulting in vivid hues due to multiple internal reflections". 

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 17 mai 2016, 10:00 AM