The necklace didn’t have a name. People described it as ‘en esclavage’ – a slave necklace – for the way its triple rows of diamonds, 647 of them, hung like chains around the neck. It didn’t have an owner, either. Its creator, Charles Auguste Boehmer, court jeweller to Louis XVI, made it expecting a royal sale. Worth two million francs, only royalty could afford it. But Marie Antoinette wasn’t buying. ‘We have more need for ships than diamonds’, she said. Desperate, Boehmer lowered the price.