Lot 154. A 15.04 carats Burmese 'royal blue' Sapphire and Diamond Ring, GraffEstimate 300,000 — 400,000 USD. Lot sold 519,000 USD. Photo: Sotheby's.

Set with a cushion-cut sapphire weighing 15.04 carats, flanked by heart-shaped diamonds, size 7, partially signed Graff. With signed box.

Accompanied by SSEF report no. 94563 and Gübelin report no. 17062020 stating that the sapphire is of Burmese origin, with no indications of heating. The SSEF report further stating that unheated sapphires of this quality are rare. The Gübelin report stating that the sapphire is 'royal blue'. 

Sotheby's. Magnificent Jewels New York, 05 Dec 2017