Lot 275. Colombian emerald and diamond parure, de Grisogono. Estimate 770,000 — 1,150,000 CHF (703,715 - 1,051,003 EUR). Photo Sotheby's

Comprising: a necklace composed of two lines of baguette diamonds, the front highlighted with step-cut emeralds and diamond and emerald pendants, length approximately 440mm, signed de Grisogono, numbered, maker's mark for de Grisogono; a pair of earrings, unsigned, Italian assay and maker's marks, post and hinged back fittings; and a ring, size 531/2, unsigned, Italian assay and maker's marks, pouch stamped de Grisogono. 

Accompanied by SSEF report no. 84961, stating that the three tested emeralds are of Colombian origin, one with a minor amount of artificial resin in fissures, one with a moderate amount of artificial resin in fissures and one with a moderate amount of oil in fissures.