her beautiful wedding tiara, which her daughter also wore in hers, is the tiara of her ancestor Eugenia de Montijo, Empress Eugenia of France. it's a lovely piece indeed.
her daughters in law, Maria Hohenlohe and Matilde Solis, however, wore the russian tiara, of the Hijar house. this tiara has however been reportedly sold by the family. Maria Hohenlohe, reportedly, refused to wear the tiara (which was large and not very attractive), but in the end wore it at her wedding.
the tiara, on matilde:
genoveva casanova, also daughter in law of the late duchess, wore a smaller tiara, which is actually the wedding tiara cayetana and eugenia wore, the Eugenia de Montijo tiara, although simplified:
she also owned these beautiful emeralds, also from queen eugenia: