So True, Margot. When alive, Diana did not set much store for her jewelry, and she had some fabulous stuff. She wore it beautifully, but she seemed not to take it too seriusly, prefering simple pearls over the over-the-top stuff the Arabs gave her.
Personally, I do not care for Camilla, but I do not think her wearing a pice of jewekry does Diana any dishonour.