Rare 18th century diamond necklace heads to auction – What’s the cost?

Sotheby's plans to auction a rare 18th-century diamond necklace in Geneva on November 11. Comprising around 500 diamonds and potentially linked to Marie Antoinette, the piece is estimated to fetch between $1.8 and $2.8 million. The necklace will be displayed in London before being shown in Hong Kong, New York, and Taiwan.