A rare Belle Époque sapphire and diamond ring. Photo Christie'sImage Ltd 2013

Set with an oval-shaped sugarloaf cabochon, weighing approximately 21.27 carats, to the single-cut diamond gallery and shoulders, circa 1910, mounted in platinum. Estimate: $1,500,000 – $2,500,000

With report CS 57128 dated 25 September 2013 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this material would be classified as Kashmir. No gemological evidence of heat. Clarity enhancement: None. 

With report 71400 dated 15 October 2013 from the SSEF Swiss Gemmological Institute stating that the sapphire’s origin is Kashmir. No indications of heating 

Christie's. MAGNIFICENT JEWELS. 10 December 2013. New York, Rockefeller Plaza -www.christies.com