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Lot 379. Important diamond necklace, the centre supporting a briolette diamond weighing 20.30 carats, by Cartier. Estimate: £220,000 - £280,000. Courtesy Sotheby's.

The front composed of three rows set with square, brilliant-cut and baguette diamonds, the centre supporting a briolette diamond weighing 20.30 carats, to a necklace composed of links set with brilliant-cut diamonds and marquise diamond clasp,  length approximately 385mm, signed Cartier, numbered, French assay and maker's marks, fitted case stamped Cartier.

Accompanied by GIA report no. 2145896940, stating that the 20.30 carat diamond is W to X range Colour, SI1 Clarity.

Sotheby's. Fine Jewels, London, 06 Jun 2018, 10:00 AM