Sure, it is sensitive but we can do it. Just leave personalities out and treat it as an exercise in historic jewels and customs.
Having thought a bit more, I think a PC would travel to a coronation wearing something and not bare headed, as does a consort to be crowned.
So a PC could wear the Diamond Diadem 1820. She could herself add a coronet at the point when all peers and peeresses add theirs at the time of the crowning of the KIng. The PC would leave wearing all that too.
--Previous Message-- : I agree that the gold bar is there to hold the : Koh-i-Noor or a Cullinan diamond. I'm not : sure if you're suggesting the Durbar tiara, : but I believe Camilla and Charles would be : in big trouble if she appeared at his : Coronation in a headpiece so connected to : Empire. How about the diamond diadem? It : is already associated with Coronations. Or : perhaps just a tiara like the Greville plus : her coronet? : : (I'm sorry if this breaks the rules about no : rights or wrongs, but appropriateness does : have to be considered. Even the diamond : diadem might be considered too much : associated with queens.) :