A pair of Colombian emerald and diamond earrings, by Harry Winston. Estimate CHF950,000 – CHF1,250,000  ($974,816 - $1,282,652). Photo Christie's Image Ltd 2015.

Each octagonal step-cut emerald detachable drop, to the pear and marquise-cut diamond cluster base, and rectangular-cut diamond surmount, weighing approximately 3.01 and 3.02 carats, within a pear and marquise-cut diamond cluster surround, 6.0 cm, mounted in platinum and gold, in blue leather Harry Winston case
With maker's mark of Jacques Timey for Harry Winston 

Accompanied by report no. 82291 dated 25 September 2015 from the SSEF Swiss Gemmological Institute stating that the origin of the emeralds is Colombia, with indications of minor amount of oil
Report no. CS70153 A and B dated 2 September 2014 from the AGL American Gemological Laboratories stating that the origin of both emeralds is Colombia, with indications of minor clarity enhancement; and an Appendix letter stating that these emeralds '... are singularly distinguished and together constitute a pair of unique rarity. (...) Both emeralds exhibit an intense and saturated green colour that is representative of top-quality stones.'
Report no. 6173309886 dated 4 September 2015 from the GIA Gemological Institute of America stating that the 3.02 carat diamond is E colour, VS1 clarity.
Report no. 1172309866 dated 4 September 2015 from the GIA Gemological Institute of America stating that the 3.01 carat diamond is F colour, Internally Flawless clarity. 

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