I have no idea if this bracelet and the matching tassel earrings are real or costume jewellery.
It could also be real jewellery, but on loan from a jeweller - Princess Astrid has several times worn jewellery pieces that she has worn only once and which were rumoured to have been borrowed.
I am not a great fan of this modern style of jewellery, but the Princess's dress looks very beautiful!
(Picture credit: Mélanie Wenger/Isopix/SIPA and Frédéric Andrieu/Agence P/SIPA, via ParisMatch.com)