Diamonds are easily the most popular jewel in royal collections; royal families have been adding diamonds to their vaults for ...

"Among the most romantic of the royal jewels crafted by Garrard for the British Royal Family, the Lotus Flower Tiara perfectly embodies the era in which it was made," the jeweler notes.

The diamond Kokoshnik tiara, which was created in 1888, actually pulls double duty—though Camilla wore it on her head, she could have worn it as a necklace, as the Garrad Royal Ledger states.

This has not stopped Marie from showing off the loaned royal jewels at Princess Madeline of Sweden's wedding in 2013, Prince Carl Philip of Sweden's nuptials in 2015, and the Danish New Year’s ...