Few things I need help with:
If you come from an aristocratic family with your own family tiaras, isn't there protocol as to when you stop wearing your own family's and start wearing the ones from your husband's family...
assuming he has not personally given you one of your own.
Also, I do not think Camilla would were the tiara she wore on her wedding day to Andrew, now that she has remarried to Charles.
The girl has got some serious jewels to play with now, okay!?!?!
I do think she does need a larger tiara due simply to the kind of hairstyle she has...it is poofier and more layered and a smaller one kind of gets lost..