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Lot 529. Attractive 12.25 carats Burmese ruby and diamond ringEstimate 140,000 — 230,000 CHF. Lot sold 350,500 CHF. Photo: Sotheby's 2012

Claw-set with a sugarloaf cabochon ruby weighing 12.25 carats, between triangular diamond shoulders, size 521/2.

Accompanied by Gübelin report no. 0302653, stating that the ruby is of Burmese origin, with no indications of thermal treatment. 

Sotheby's. Magnificent Jewels, Geneva, 14 Nov 2012