The Imperial Crown of Russia, also known as the great imperial crown, was used by the monarchs of Russia from 1762 until the Russian monarchy's abolition in 1917.
https://en.wikipedia.org/wiki/Imperial_crown_of_Russia
Russian regalia used prior to the creation of the great imperial crown.
https://upload.wikimedia.org/wikiped...an_regalia.jpg
1896 image of the crown (at bottom).
https://upload.wikimedia.org/wikiped...n_Jewels_3.jpg
After the 1917 revolution, Russia's new rulers debated what to do with the crown jewels. This 1925 photo shows the collection. However, a 1922 album at the U.S. Geological Survey includes photos of four items that are not described in the official 1925 inventory.
Photos:
https://c10.quickcachr.fotos.sapo.pt...975_8tTVO.jpeg
https://c10.quickcachr.fotos.sapo.pt...1977_Bp9z5.png
The Mysterious Disappearance Of The Russian Crown Jewels
https://www.npr.org/2012/12/30/16821...n-crown-jewels
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