Lot 208. An impressive 47.72 carats Colombian emerald and diamond ring, by David Webb. Estimate CHF 2,000,000 - CHF 2,500,000 (USD 2,016,474 - USD 2,520,593). Unsold. Photo Christie's Images Ltd 2016.

Set with an octagonal step-cut emerald, weighing approximately 47.72 carats, set within a graduated marquise-cut and pear-shaped diamond surround, to the pavé-set diamond gallery and shoulders, ring size 5, mounted in platinum and gold, in blue leather David Webb case. Signed David Webb, no.GC11

Accompanied by report no. 16025046 dated 23 February 2016 from the Gübelin GemLab stating that the origin of the emerald is Colombia, with no indications of clarity enhancement, an Information Sheet on 'Untreated emeralds' and an Appendix stating that this emerald 'possesses a saturated and homogeneous colour, combined with an exceptional degree of transparency'. 

Report no. CS1072702 dated 15 January 2016 from the AGL American Gemological Laboratories stating that the origin of this emerald is Colombia, with no clarity enhancement, and a 'Jewel Folio' stating that 'such a combination of quality factors, large size, origin determination and absence of treatment as present in this exceptional Colombian emerald is very rare'. 

Further accompanied by certificate of authenticity dated 18 March 2016 from David Webb. 

Christie's. Geneva Magnificent Jewels, 15 November 2016, Geneva