An emerald and diamond ring, by Cartier. Photo Christie's Image Ltd 2012

Designed as a square step-cut diamond weighing approximately 4.08 carats confronting a similarly-cut emerald weighing approximately 3.59 carats, set diagonally on the diamond-set tapering band, French marks for platinum, maker’s case, one diamond deficient. Signed Cartier and no.709619 52. Estimate: $111,160 – $142,920. Unsold

Accompanied by report no.28692 dated 18 December 1995 from the Swiss Gemmological Institute (SSEF) stating the emerald is of Colombian origin and report no. 8699954 dated 20 December 1995 from the Gemological Institute of America (GIA) stating the 4.08 carat diamond is G Colour, VS1 Clarity with no fluorescence; together with the original Cartier certificate of authenticity

Christie's. IMPORTANT JEWELS. 12 December 2012. London, King Street - www.christies.com