The secret history of the Hope Diamond has been revealed.

The research helps confirm the Hope Diamond as originating with a 115-carat stone found in India in 1668. That stone was sold to King Louis XIV of France who had it cut into the 69-carat French Blue. The French Blue was stolen during the French Revolution.

Just over 20 years later, after the statute of limitations expired, a large blue diamond was quietly put up for sale in London, and eventually Henry Philip Hope purchased it.

Finally donated to the Smithsonian by jeweler Harry Winston, the now 45.52 carat stone is the world's largest blue diamond.