Are you sure it was in the 1990's? I have once seen a clip from the pre-Wedding Ball of her son Erich and Mahtilde of Württemberg where she was wearing a Lovers Knot tiara.
--Previous Message-- : The lover's knot tiara worn by the Fürstin von : Waldbourg Zeil was bought at auction in : Geneva in the 1990s. It is the one owned, : long time ago, by the duchess of Cambridge. : It was then inherited by her daughter, : Augusta duchess of Mecklembourg Strelitz and : transmitted to princess Augusta's grand : daughter, princess Jutta, wife of the : Montenegro crown prince. All this was : mentioned in the catalogue of the auction. : Actually, the necklace worn by the fürstin : of Waldbourg Zeil, although it much more : recent, was also in the same auction. It : seems it was bought (I guess by the prince : of Walbourg Zeil for his wife) in order to : make a full set. :