Kate Middleton Has Her Pick of All These Royal Tiaras

Not to be confused with the Cambridge Lover's Knot, the Vladimir has possibly one of the best backstories as it was smuggled out of Russia after the revolution in the brim of a hat and bought by Queen Mary. It was customized so that the 15 hanging pearls could be replaced with emeralds, and since the queen inherited it upon her coronation, she has worn it both ways.