Before Marie Antoinette ascended to the throne, King Louis XV of France commissioned Parisian jewellers Charles Auguste Boehmer and Paul Bassange to craft an extravagant diamond necklace that would surpass all others in magnificence.
This astonishing gift, intended for the king's mistress, Madame du Barry, is alleged to have featured 647 diamonds and carried an astounding price tag of 2,000,000 livres, around $37 million (£31m) in today's money.
Following the sudden death of the king in 1774, the necklace remained unpaid for, leaving its creators close to financial ruin. They made multiple attempts to sell the necklace to Marie Antoinette but she declined, reportedly stating: "We have more need of Seventy Fours [a type of ship] than necklaces."