The Great Imperial Crown made in 1762 for the coronation of Catherine the Great by the Russian court jeweler J.Pauzie - five thousand diamonds arranged in a pattern of laurel wreaths and oak branches. The Russian Crown Jewels
The Small Imperial Crown of Russia - This silver & diamond crown was created in 1856 by Russian Court Jewelers for Alexander II's wife, Maria Alexandrovna, who later presented it to her beloved daughter-in-law Dagmar-Minnie-Marie Feodorovna.
Imperial Crown of India was made for King George V to wear at the Delhi Durbar in 1911 when he was acclaimed Emperor of India. A special crown had to be made as the Imperial State Crown cannot be taken out of England
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
Imperial Crown of the Holy Roman Empire - Wikipedia