Lot 2026. A rare 25.00 carats cushion-shaped Colombian emerald and diamond ring, by Boghossian. Estimate HK$12,000,000 – HK$18,000,000 (US$1,500,000-2,300,000). Photo Christie's Image Ltd 2016.

Set with a cushion-shaped emerald, weighing approximately 25.00 carats, to the cushion-shaped diamond gallery with circular-cut diamonds, extending to the rectangular-cut diamond three quarter-hoop, mounted in gold, ring size 4¼. Signed Boghossian

Accompanied by report no. 68680 dated 5 June 2013 from the SSEF Swiss Gemmological Institute stating that the emerald is of Colombia origin, with no indications of clarity modification; also accompanied by an appendix stating that the natural emerald possesses extraordinary characteristics and merits special mention and appreciation. The emerald exhibits a saturated green colour and an attractive purity. Microscopic examination revealed inclusions, which represent the hallmarks of Colombian emeralds from the famous mining areas as Muzo, Coscuez, and Chivor, all located in the green foothills of the Cordillera Oriental in the Colombian Andes. Its saturated green colour is due to a combination of well-balanced trace elements in the stone, typical and characteristic for the finest emeralds of Colombia. Natural emeralds from Colombia of this size and quality are rare and exceptional

Report no. 13050166 dated 28 May 2013 from the Gübelin GemLab stating that the emerald is of Colombia origin, with no indications of clarity enhancement

Christie's. HONG KONG MAGNIFICENT JEWELS, 31 May 2016, Convention Hall