The coronet comes from Empress Auguste Viktoria, wife of Wilhelm II. not from Empress Augusta, wife of Wilhelm I. It was said that it is still in the family and apparently there have been made smaller pieces out of it. In the second pic it is worn by Princess Kira of Prussia.
--Previous Message-- : : Tremendous! Can you tell us who is wearing : it in your second pic please? : The back of the middle lady looks like : Princess Marina, Duchess of Kent, judging by : her "tiara". : : Edited for typos. :