Curious about which diamond encrusted crowns are considered the best?

4th generation diamond expert, G.I.A.

As Landau explains of her favorite of all the British wedding tiaras, “First place is clear!”

Megan Markle on wedding day wearing tiara and veil

Adding, “It looks like it is filled with old European cut and old mine cut diamonds.”

According toTatler, the unique tiara was originally created in 1919 for socialite Margaret Greville.

While it’s unknown who actually paid for the purchase of the tiara.

Queen Elizabeth II on wedding day and Princess Beatrice on wedding day in same tiara

Princess Eugenie on wedding day wearing emerald and diamond tiara

Princess Margaret on wedding day with Antony Armstrong-Jones wearing Poltimore tiara

Princess Diana on wedding day in diamond tiara and veil

Kate Middleton on wedding day in tiara and veil smiling