A Colombian emerald and diamond fringe necklace, by Harry Winston. Estimate CHF290,000 – CHF485,000  ($297,575 - $497,669). Photo Christie's Image Ltd 2015.

The baguette-cut diamond necklace, suspending fourteen pear-shaped emerald and diamond clusters to the front, with pear-shaped and marquise-cut diamond accents, 39.5 cm, mounted in platinum and gold, in black Winston case
With maker's mark of Jacques Timey and signed Winston for Harry Winston 

Accompanied by report no. 15100002 dated 5 October 2015 from the Gübelin GemLab stating that the origin of the emeralds is Colombia, with indications of minor clarity enhancement.
Report no. 82349 dated 29 September 2015 from the SSEF Swiss Gemmological Institute stating that the origin of the emeralds is Colombia, with indications of minor to moderate amount of artificial resin. 

CHRISTIE'S. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva