Lot 248. 20.46 carats Burmese sapphire and diamond ring. Estimate 250,000 - 350,000 USD. Lot sold 300,000 USD. Photo: Sotheby's 2007

The cushion-shaped sapphire weighing 20.46 carats, flanked by 2 bullet-cut diamonds, mounted in platinum, size 6¼.  

Accompanied by AGTA report no. 12011908 stating that the sapphire is of Burmese origin; no indications of heating. 

Sotheby's. Magnificent Jewels. New York, 24 Apr 2007