For sale - THE diamond necklace.

All eyes will be on Sotheby's Geneva this November, when a necklace, thought to contain diamonds from the scandalous diamond necklace of 1784, comes under the hammer. 

The lot, now headlining Sotheby's 13-14 November Royal & Noble Jewels sale is anticipated to fetch between CHF 1.6-2.2 million (around US$1.85-2.55 million).

The necklace belonged in the early 19th century to the Marquess of Anglesey.  

 If the historical description that the diamonds on the original necklace were the size of hazelnuts is taken at face value, it can be presumed that the larger diamonds above the tassels on either side of the necklace could be the ones stolen from the French necklace. It is unclear how they were sourced or when they were fashioned onto the 300-carat diamond necklace, but at some point the necklace came into the possession of the Marquess of Anglesey's collection. 

Lady Marjorie Paget, wife of the 6th Marquess, famously photographed
 by Cecil Beaton wearing the necklace at George VI's coronation

 According to Sotheby's, the seventh Marquess parted with the piece in the 1960s. By 1976, it was on exhibit at the American Museum of Natural History in New York City. Later, it was acquired by an "important Asian collector."

18th-Century Necklace to Headline Sotheby's Royal and Noble Jewels Auc – Diamond Designs (dia-designs.com)

From a French royal scandal to two British coronations, a 300-carat diamond necklace heads to Sotheby's | Auctions News | THE VALUE | Art News