Kokoshnik Tiara of Alexandra Feodorovna, consort of Czar Nicholas II, Russia (ca. 1900; aquamarines, diamonds, platinum). Whereabouts unknown.
Czar Nicholas II (1868-1918) Leader of Russia during the Russo-Japanese War, was in power when Mark Twain wrote "The Czar's Soliloquy" which advocated assassination of the Czar & his family. (Good to know!) Photo from Library of Congress Prints & Photographs Division.