An Important Diamond Ring, by Harry Winston. Photo: Christie's Images Ltd 2012

Set with a rectangular-cut diamond, weighing approximately 10.69 carats, mounted in 18k gold, in a Harry Winston navy leather box. Estimate $800,000 - $1,200,000

With maker's mark for Jacques Timey 
With report 1142346018 dated 12 January 2012 from the Gemological Institute of America stating that that the diamond is D color, VVS1 clarity; accompanied by a working diagram indicating that the clarity may be potentially internally flawless 

Christie's. Magnificent Jewels, 17 April 2012, New York, Rockefeller Plaza