Originally Posted by Marengo
Wasn't the last tiara property of Princess Olga of Yougoslavia, nee Pss of Greece & Denmark? I believe it is actually the same tiara as pictured as the 'Diamond tiara', albeit without the lower row of 'diamants' (as they were replaced with fakes).
Yes, you're right Marengo. Description from first picture:
Made by Boucheron for a Russian aristocrat, Princess Abamelek. Later owned by Princess Olga of Greece.