Lot 372. 17.84 carats Ceylon sapphire and diamond ring, 1930s. Estimate 30,000 — 50,000 GPB. Photo: Sotheby's.

Claw-set with a hexagonal-shaped sapphire weighing 17.84 carats, the shoulders accented with triangular-shaped diamonds, French assay and partial maker's marks.

Accompanied by The Gem & Pearl Laboratory report no. 11951, stating that the sapphire is of Ceylon origin, with no evidence of heat treatment.

Sotheby's. Fine Jewels, London, 15 Mar 2016, 10:00 AM