Lot 257.  A diamond and coloured diamond fringe necklace and earring set, by Adler. Estimate CHF 1,200,000 - CHF 1,800,000 (USD 1,194,436 - USD 1,791,654). © Christie's Images Ltd 2017

The oval-cut diamond necklace suspending a pear-shaped and oval-cut diamond graduating fringe, together with a pair of earrings en suite, necklace 43.0 cm, earrings 5.0 cm, mounted in gold, in black leather pouch. With maker's marks for Adler 

The necklace accompanied by 6 reports dated March 2017 from the GIA Gemological Institute of America stating: 

Carat Colour Clarity Report no. Shape
11.74 Y-Z SI2 5181247114 Pear
5.62 Y-Z SI1 5182249155 Pear
5.16 W-X VS1 Not pot/Impro 5182249186 Pear
5.15 Fancy Light Yellow SI1 6187249226 Oval
5.07 Fancy Light Yellow VS2 2181249138 Pear
5.03 U-V VS2 5182249147 Pear 

The earrings accompanied by 2 reports dated March 2017 from the GIA Gemological Institute of America stating that:

Carat Colour Clarity Report no. Shape
6.32 W-X VS2 5181249062 Pear
6.12 Y-Z VVS2 pot 5182249167 Pear

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

Christie's. Magnificent Jewels, 17 May 2017, Geneva