Lot 301. 18 Karat Gold, Platinum, Opal, Enamel and Diamond Necklace, David Webb. Estimate 180,000 — 220,000 USD. Photo Sotheby's.

Of graduated design, composed of 29 opal beads measuring approximately 24.4 to 11.2 mm, spaced by carved emeralds and links applied with black enamel, completed by rondelles set with round diamonds weighing approximately 3.70 carats, length 36½ inches, signed Webb, numbered ES305.

Accompanied by a Certificate of Authenticity from David Webb.