An important sapphire and diamond pendant necklace. Photo Christie's Image Ltd 2013

Suspending a cushion-cut sapphire, weighing approximately 91.38 carats, from horizontally-set graduated baguette-cut diamonds, to the baguette-cut diamond neckchain, joined by a circular-cut diamond clasp, mounted in 18k white gold. Estimate $800,000 - $1,200,000. Price Realized $1,805,000

With report CS 81948 dated 25 September 2013 from the American Gemological Laboratories stating that it is of the opinion of the Laboratory that the origin of the sapphire would be classified as Burma (Myanmar). Heat Enhancement: None

With report 71001 dated 8 September 2013 from the SSEF Swiss Gemmological Institute stating that the analysed properties confirm the authenticity of the transparent sapphire. No indications of heating. Origin: Burma (Myanmar). Accompanied by a supplemental letter from the SSEF Swiss Gemmological Institute attesting to the rarity and prestige of the sapphire

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