Accompanied by AGL report no. 1096216 stating that the emerald is of Classic Colombian origin, with no clarity enhancements. 

Lot 80. A Rare 19.55 carats Burmese 'Royal Blue' Sapphire and Diamond Ring. Estimate 600,000 — 800,000 USD. Lot sold 1,095,000 USD. ©  Sotheby's.

Centering a cushion-cut sapphire weighing 19.55 carats, flanked by two baguette diamonds, size 5½.

Accompanied by AGL report no. CS80701 dated June 25, 2010 stating that the sapphire is of Burmese origin, with no indications of heating. Together with a letter stating that Burmese sapphires "possessing such an extraordinary combination of attributes...are exceedingly rare."

Sotheby's. Magnificent Jewels, New York, 4 december 2018