We've saved the best for last! The Poltimore Tiara combines everything we love about each of these magnificent tiaras into one beautiful crown: the regal coronation crown style, detailed curls and flowers, a convertible frame, and, of course, the many glittery diamonds. In 1960, Princess Margaret married photographer Antony Armstrong-Jones while wearing this enormous sparkler (per Vogue). It was originally owned by Lady Poltimore in the 1800s and can be worn at least four different ways (per The Court Jeweller).
One expert from Garrard confirmed to Vogue that Princess Margaret elected to pay for the tiara herself, despite the slew of tiaras she could choose from as a royal. "We're finding more and more now that women are purchasing for themselves, but way back in 1959, she chose it for herself. She must've loved it to do that." The diadem, which cost the princess £5,500 (or about $6,600), was auctioned after her death for over £900,000 (roughly $1 million) (per Christie's). Today, it is estimated to be worth upward of £3 million, or about $3.6 million (per Express).
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