Burmese Pigeon's Blood Ruby and Diamond Ring. Estimate 5,800,000 — 6,800,000 HKD (679,743 - 796,941 EUR ). Photo Sotheby's

Centring on a cushion-shaped ruby weighing 5.15 carats, to surround set with six triangular-shaped diamonds together weighing approximately 7.65 carats, the shoulders embellished by circular-cut diamonds together weighing approximately 1.10 carats, mounted in 18 karat white gold. Ring size: 6

Accompanied by Gübelin and GRS reports numbered 14071133 and GRS2013-068917, dated 6 August 2014 and 28 June 2013 respectively, stating that the 5.15 carat ruby is natural, of Burmese (Myanmar) origin, vivid red (GRS type "pigeon's blood"), with no indications of heating. 

Sotheby's. Magnificent Jewels & Jadeite, Hong Kong, 07 oct. 2015, 02:00 PM