2. The Lover’s Knot Tiara of Queen Mary
Donn by: Diana, Princess
Been in possession since 1914
Value Approximation: $4 million
The Lover’s Knot Tiara has become increasingly well-known as Kate Middleton’s go-to headdress in recent years. It’s easy to understand why the Duchess finds it so endearing. Ultimately, it’s eye-catching, and the diamond and pearl topper was once owned by Diana, Kate’s mother-in-law, whom she never had the opportunity to meet.

Princess Diana’s Lover’s Knot Tiara owned by Queen Mary © Anwar Hussein via Getty Images
Before the headgear finally made its way down the line, Queen Mary had the diadem commissioned in 1914. Princess Diana received it as a wedding present from Queen Elizabeth II, but she was forced to return it after her breakup with Charles in the 1990s. Due of its extensive past, its estimated value is approximately $4 million.
Diana got a lot of use out of it in the years before her marriage broke up, even though she had to part with it. The Lover’s Knot Tiara is undoubtedly one of the best items in the collection because of its big pearls and straightforward knotted diamonds.
