It was a shining family secret for more than 100 years.

Descendants of Austria’s royal family have revealed that a missing treasure, a large diamond dating back to the House of Medici whose mysterious whereabouts inspired several movies and books, has actually been kept safe in secret since 1918.

The Habsburg kin kept mum about the historic Florentine Diamond for decades, but broke their vow of silence to divulge that the jewel was always hidden inside their vault in Canada, the New York Times reported on Thursday.

The historic Florentine Diamond, dating back to the House of Medici, has been discovered. Universal Images Group via Getty Images

Karl von Habsburg-Lothringen, 64, grandson of fleeing Emperor Charles I, said that as his family’s dynasty came to an end at the conclusion o

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