The Imperial State Crown of Great Britain, Tower of London. It incorporates the "Black Prince's Ruby", a 140 ct. This image of the crown was taken prior to the 1953 coronation, when the crown was modified for Queen Elizabeth II
A crown for a Margaret! The crown of Margaret of York - sister of King Richard III and wife of Charles the Bold, Duke of Burgundy.The crown is one of only two English crowns from the medieval regalia to have survived being destroyed by Oliver Cromwell.
The Russian Imperial Crown. First used at the Coronation of Catherine the Great and last used at the coronation of Nicholas II.Catherine’s crown was made of diamonds, hundreds of pearls and a 415 carat ruby purchased from a Chinese Emperor.