Grand Duchess Maria Georgievna of Russia, born Princess Maria of Greece and Denmark, wears a kokoshnik that appears to be set with pearls in an official court portrait, ca. 1900; I don’t have any specific information about the tiara’s status today

Grand Duchess Alexandra Georgievna of Russia, born Princess Alexandra of Greece and Denmark, wears a diamond fringe tiara backed by a fabric kokoshnik in an official court portrait, ca. 1890; the diamond fringe may be the same one that was later worn by her widower’s second wife, Princess Olga Paley, and which was confiscated by the government after the revolution