The brooch caught my eyes, but I wasn't able to place it. Thank you, Thomas, for the verification. It's a beautiful piece. And thank you for including the video. I loved seeing how flexible the rather large brooch is constructed.

I thought that some of the pearls in Horten's necklace have the characteristic shape of the ones in the Bourbon-Parma necklace, but found it too difficult to decide without a close-up (and probably even then). Vincent Meylan has in the meantime confirmed on Instagram it's the same necklace. I'm pretty sure the big solitaire was restored as the necklace's clasp.