The York Tiara
Queen Elizabeth II gave Sarah Ferguson the York Tiara as a wedding gift in 1986 when Ferguson married Prince Andrew. The tiara is worth $800,00 and is still owned by Ferguson, despite the fact that she is divorced from Prince Andrew.
The George IV State Diadem
King George IV made this incredible headpiece in honor of his 1821 coronation. It features more than 1333 diamonds and two strings of pearls all around. The diadem is worth $600,000 and is said to be quite heavy. Queen Elizabeth II wore it on her coronation day as well.