Lot 232. 17.39 carats Burmese 'royal blue' sugarloaf sapphire and diamond ring, circa 1930. Estimate 305,000 — 510,000 CHF. Photo: Sotheby's

Set with a sugarloaf sapphire weighing 17.39 carats, the mount accented with single-cut and rose diamonds, size 56, two small diamonds deficient.

Accompanied by SSEF report no. 73433, stating that the sapphire is of Burmese origin, with no indications of heating, 'royal blue' colour.

Sotheby's. Magnificent Jewels and Noble Jewels, Sessions 1 and 2, Genève, 16 mai 2017, 10:30 AM