It was always known that the Wedding Gift Diadem came with two bases, as María del Carmen Polo y Martínez-Valdés, Señora de Meirás, presented these -in public- to Doña Fabiola de Mora y Aragón.
See picture.
The idea of only the base is charming and is definitely worth a try. Imgagine this diadem without the fleurons:
see picture.
I think the rumour about the "fake" diadem is just a
canard. It has been known that the central stones were not of the most valuable materials. The green stones are not emeralds. The red stones are not rubies. The lightblue stones are real aquamarines. The rest of the diadem seems very real to me anyway. At
this XL-picture you see the fleurons added to a necklace. I have no reason to believe that the diamonds are just glass beads.