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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 5½signed Tiffany & Co., numbered 28783361. With signed box.

Accompanied by SSEF report no. 58340 dated January 26, 2011 stating that the emerald is of Colombian origin, with no clarity enhancements. Together with a letter stating that "natural emeralds from Colombia of this size and quality represent a great rarity and the described gemstone is thus a very exceptional treasure."

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

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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."

Accompanied by Gübelin report no. 1007097 dated July 20, 2010 stating that the sapphire is of Burmese origin, with no indications of heating, this color variety of sapphire may also be called 'royal blue' by members of the trade.

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