A sapphire and diamond ring of approx. 30.20 cts. by Cartier

Lot 296. Set with a cushion-cut sapphire, weighing approximately 30.20 carats, within a pear-shaped diamond surround, mounted in platinum
Signed Cartier, no.32 NNNI
With report 0708610 dated 12 September 2007 from the Gübelin Gem Lab stating that the gemmological testing revealed characteristics consistent with those of sapphires originating from Burma (Myanmar). No indications of heating

With report CS 38685 dated 28 November 2006 from the American Gemological Laboratories stating that it is the opinion of the Laboratory, based on the weight of evidence, that the origin of this material would be classified as Burma (Myanmar). Heat Enhancement: None. Clarity Enhancement: None
Estimate: $300,000-500,000

Christie's. Magnificent Jewels. 11 December 2007. 20 Rockefeller Plaza, New York