So sad to hear about Princess Xenia!
I also included that Fleur de Lys Tiara in my article! Princess Cécile, talked about family jewels in an interview a few years ago:
"There were these family events or bigger balls or things that my parents or my aunt or grandmother attended. As a little girl of course there was just this thing when all the preparation started and all the dresses came out. They would all discuss which dresses they were going to wear, then who was going to wear which tiara and which jewels would go with what. When I was smaller and we were in London for the wedding of Prince Charles and Lady Diana, we were able to be there and watch from Buckingham Palace. I was still too young to go to any of the balls or anything, but it was special watching my mother getting dressed up and putting these things on. [It was special], just sitting there and staring at these things and getting to see them and grow up with them – not just in the trays but actually still worn which I think is rarer and rarer these days.”