Lot 178. The Star of Sierra Leone VI. A 21.69 carats D colour, VVS2 clarity, Type IIa pear-shaped diamond ring, by Harry Winston. Estimate CHF 1,400,000 - CHF 1,800,000 (USD 1,412,727 - USD 1,816,364). Price realised CHF 1,447,500. Photo Christie's Images Ltd 2016.

Set with a pear-shaped diamond, weighing approximately 21.69 carats, to the baguette-cut diamond tapered shoulders, ring size 5 ½, mounted in platinum. Signed Winston for Harry Winston.

Accompanied by report no. 2175703908 dated 28 June 2016 from the GIA Gemological Institute of America stating that the 21.69 carat diamond is D colour, VVS2 clarity, a Diamond Type Classification letter stating that the diamond has been determined to be Type IIa, and a letter of authentication noting the re-cut of the 22.27 carat diamond (known as the Star of Sierra Leone VI) to 21.69 carats.

Further accompanied by report no. 1251615 dated 29 January 1981 from the GIA Gemological Institute of America stating that the 21.69 carat diamond is D colour, VVS2 clarity.

Copy of report no. NY674663 dated 12 November 1973 from the GIA Gemological Institute of America stating that the diamond, weighing then 22.27 carats, is D colour, VVS1 clarity. 

Copy of invoice dated 26 December 1973 and copy of insurance valuationdated 30 March 1983, both from Harry Winston. 

Christie's. Geneva Magnificent Jewels, 15 November 2016, Geneva