Diamond Necklace. Photo Sotheby's

Designed as a line of marquise-shaped and brilliant-cut diamonds, suspending a graduated fringe of pear-shaped diamonds, length approximately 425mm. Estimation 38,000 — 48,000 GBP

Accompanied by 17 GIA reports stating that the diamonds weighing 0.31 to 0.91 carats are D Colour, VS2 to VVS1 Clarity.