Sapphire and diamond ring, Ronald Abram. Photo Sotheby's.

Claw-set with a cushion-shaped sapphire weighing 4.52 carats, between heart-shaped diamond shoulders, size 491/2, signed Ronald Abram. Estimate:  140,000 – 185,000 CHF

Accompanied by SSEF report no. 69958, and Gübelin report no. 050904, dated 15 September 2005, each stating that the sapphire is of Kashmir origin, with no indications of heating, the SSEF report also stating ‘Royal Blue’ colour.

Sotheby's. Magnificent Jewels. Geneva | 13 Nov 2013 - www.sothebys.com