The crown of Queen Alexandra was a new consort crown, whose style was more akin to the European royal crowns, than the standard style of the British crowns. The arches were detachable, which like the crown of Queen Elizabeth, meant the crown could be worn
Part of the dutch cut Cullinan diamond HRM is wearing the Imperial State Crown of Great Britain, which incorporates the "Black Prince's Ruby", a 140 ct. The crown was modified for Queen Elizabeth II prior to the 1953 coronation.
The Crown of Eric XIV (before a twentieth century refurbishment). The crown of the King of Sweden was manufactured in Stockholm in 1561 by a Flemish goldsmith named Cornelius ver Welden for the Swedish King Eric XIV.
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.