Lot 1941. A unique 3.37 carats I1  Type IIb fancy intense blue diamond and diamond ring, by Etcetera. Estimate HKD 4,800,000 - HKD 6,500,000. Price realised HKD 21,660,000. © Christie's Images Ltd 2017

The hexagonal-shaped fancy intense blue diamond, weighing approximately 3.37 carats, to the tapered baguette-cut diamond edges and rectangular-cut diamond gallery, each weighing approximately 1.02 to 1.00 carats, joined to the circular-cut diamond half-hoop, mounted in gold, ring size 4 ½, in brown velvet Etcetera case.With maker's mark for Etcetera. 

Accompanied by report no. 7241395225 dated 14 December 2016 from the GIA Gemological Institute of America stating that the diamond is fancy intense blue colour, I1 clarity; and a Diamond Type Classification letter stating that the diamond has been determined to be Type IIb

Six reports dated from 2 June 2015 to 17 November 2015 from the GIA Gemological Institute of America stating that the rectangular-cut diamonds range from E to F colour, internally flawless to VS2 clarity.