The Russian Imperial Crown. First used at the Coronation of Catherine the Great and last used at the coronation of Nicholas II. The magnificent crown holds the second largest spinel in the world, a precious red spinel weighing an impressive carats.
Austrian Imperial Crown The Crown of Rudolf II, later Crown of the Austrian Empire (made by Jan Vermeyen in Prague in It is made of pure gold. Partially enameled and studded with diamonds, rubies, sapphires, pearls and cushioned with velvet.