I think the more important issue is what people will think, seeing Camilla in one of the Queen Mother's most recognisable pieces of jewellery. As already pointed out, the Queen Mother isn't in the greatest position to make her feelings known at the moment.
Since public opinion does seem to be warming to Camilla, it isn't beyond the realms of the possible that she'd end up with that tiara. It would be less provocative than giving her the Queen Mother's other one, which was specifically reserved for the use of future queens.
Since public opinion does seem to be warming to Camilla, it isn't beyond the realms of the possible that she'd end up with that tiara. It would be less provocative than giving her the Queen Mother's other one, which was specifically reserved for the use of future queens.