Lot 207. A coloured diamond rivière necklace. Estimate CHF500,000 – CHF700,000 ($514,205 - $719,886). Photo Christie's Image Ltd 2016

Composed of fifty-one graduated rectangular-cut coloured diamonds, the seven principal stones weighing approximately 13.27, 7.77, 7.33, 7.15, 6.72, 6.04 and 5.65 carats, to the concealed clasp, 37.0 cm, mounted in gold

The seven principal diamonds accompanied by report nos. 2171536111, 2175536217, 1172536234, 2175536198, 2175536723, 1172536272 and 5171536167, dated 17 to 21 March 2016 from the GIA Gemological Institute of America stating that the 13.27 and 6.72 carat diamonds are Fancy Light Yellow colour,VS1 clarity, the 7.77 and 7.33 carat diamonds are Fancy Light Yellow colour, VVS2 clarity, the 7.15 carat diamond is Fancy Yellow colour, VVS2 clarity, the 6.04 carat diamond is Fancy Yellow colour, VS1 clarity, and the 5.65 carat diamond is Y to Z colour, VS1 clarity.

Please note that the remaining yellow diamonds have not been tested for natural colour origin.

Christie's. GENEVA MAGNIFICENT JEWELS, 18 May 2016, Geneva