Burmese 'pigeon blood red' 4.31 carats ruby and diamond ring. Photo Sotheby's 2013

The oval ruby weighing 4.31 carats, claw-set between triangular diamonds, size 54. Lot 448. Estimate 145,000 — 235,000 CHF. Lot sold 653,000 CHF

Accompanied by SSEF report no. 67458, stating that the ruby is of Burmese origin, with no indications of heating, 'pigeon blood red' colour.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 14 May 2013