So, in the midst of insomnia, I'm browsing online tiara shops. As you do.
And I think I found the source from which St Hoefias wedding tiara came from...they have a delightfully similar version with diamond studs and christmas trees too. The different gems, such as pearls, aquamarine and emeralds are sold separately.
https://beelementalstore..../products/protector-tiaraI may be in a snarky mood, but $30 for a tiara is just about the right price for a Saint like Hoefia

as opposed to a reworking of an unseen piece of jewellery apparently given to Silvia.
P.s. for those of you wanting to buy tiaras close to real royal ones, they do an interesting version of the Cameo, the Leutchenberg and other famous royal tiaras from various royal families!
I'll switch off my phone now and hopefully get some sleep!