Originally Posted by Tilia C.
I think that the times for leaving heritage jewels to children other than the heir are in the past. We assume that JC bought back the Cartier loop tiara from his sister in order to keep it for the monarch. So we can assume that JC and also Queen Sofia are aware of the need to keep these heirlooms in the RF, and that means with the monarch.
What Cristina needs more than a tiara is money, or other useful assets. I'm convinced that Queen Sofia is aware of that fact, and will leave those old family heirlooms to either to Felipe or the Princess of Asturias. That Queen Letizia hasn't worn the tiara yet, does not mean that she never will (at least I hope so). And nobody can yet know which tiaras Leonor will favour in the future.
Needless to say, the best way to solve those kind of conficts is to place (most of) the royal jewels under a family foundation (effectively, a trust), as the Bernadottes and the Orange-Nassaus did in the past. That way, the entire family, including the collateral branches, can share them when needed and the jewels are guaranteed to stay in the family for use by future generations. In fact, even Queen Elizabeth II should consider doing that as she has a quite large number of descendants to contemplate in her will. She probably doesn't worry too much about it though because of the extraordinary large number of jewels she owns.
In Spain and Belgium, on the other hand, keeping the more important pieces in the family is absolutely critical as their collection has already become fairly small over the years. For example, it is a disgrace IMHO that Queen Paola seems to have left to Princess Astrid her one and only personal tiara, which is actually an heirloom from Queen Elisabeth of Belgium and should stay accordingly with Queen Mathilde or the Duchess of Brabant.