The aigrette was a wedding present without any base and I think it is just pinned into her hair.
I think I recall reading about more bases to her tiaras, than just the Girls, from the QD, but cannot find notes just now. And I think the topic has been discussed on this RJW.
--Previous Message-- : I should think the band is simply the base on : which the upstanding aigrette part is : mounted. : Or are you implying that this band might : have served as a base for a later tiara : which could have been constructed using it? : : --Previous Message-- : : I would really love to identify the band in : her hair. : : --Previous Message-- : : Link to the Royal Collection : : : : : : :