Will it be the big Spanish sparkler or the petite British tiara?

This imposing diamond tiara features the fleur-de-lis, a symbol of the House of Bourbon, in its design. It was a gift from King Alfonso XIII of Spain to his bride, Queen Ena, in 1906. The sparkler passes from monarch to monarch in Spain, and it’s now being worn by Queen Letizia.

This diamond scroll tiara, made in the 1930s by Cartier, was a wedding anniversary present from King George VI to the Queen Mother. It’s since been worn by Princess Margaret and Princess Anne, and in 2011, the Duchess of Cambridge memorably chose it as her bridal tiara.