Magnificent emerald and diamond necklace, Bulgari, circa 1970. Photo Sotheby's

Designed as a graduated series of flower head clusters, each set with a step-cut emerald bordered with brilliant-cut diamonds, spaced by four marquise-shaped diamonds, suspending a pear-shaped and a step-cut emerald surrounded by brilliant-cut stones, length approximately 430mm, Italian assay and maker's marks, signed Bulgari, case. Lot 733. Estimation 1,400,000-2,800,000 CHF

Accompanied by Gübelin report no. 12020038, stating that the emeralds are of Colombian origin, with none to minor indications of clarity enhancement.

Sotheby's. Magnificent Jewels and Noble Jewels. Genève | 14 mai 2012, 11:00 AM www.sothebys.com