Queen Fabiola does not share her personal jewelry with Paola or any other member of the family. The tiara she received from Franco is only used by her (and not very frequently)., as is the tiara she received from jeweller Wolfers.
The Belgian RF owned a lot more jewels in the past, dispite being 'new', but many went to Queen Marie-Jose of Italy, GD Josephine-Charlotte or were sold by Princess Liliane. Of other jewels the whereabouts are unknown to, but they are generally considered to be sold (like the floral diademe of Queen Marie-Henriette).