Stolen in 1792, the French Blue diamond's fate puzzled historians for centuries
Stolen along with the French Crown jewels, this prized blue diamond stayed lost for centuries until the detective work of historians and scientists cracked the case.
"Some chroniclers believe that the French Blue didn’t go to London with Lordonner. Instead, it arrived much later in a scenario worthy of a political thriller. According to this theory, the revolutionary armies desperately needed a victory around the time Austria and Prussia were threatening to invade France in 1792. Led by the Prussian Duke of Brunswick, an invasion was repelled by the French at Valmy and retreated back over the Rhine on September 20. Revolutionary momentum returned and fervour soared...."