Hi Casper, thanks for the great pictures. By the way it is HSH and not HRH
What I understood was that Princess Gracia had no large collection since her mother-in-law Princess Charlotte bypassed her jewels to Princess Caroline.
I think all jewels above were loans to the Princess. I believe the only ruby set owned by the Princess was the diamond-and-rubies suite given by the Société des Bains de Mer (not in the pictures above).