Both pieces are from the jeweller Manalys, Brussels. http://manalys.com/jewelry/necklaces/feuilleI would guess they belong to Hélène. A wedding present by her in-laws perhaps? Hélène's mother in law for sure loves jewellery. :D And somehow it would strike me as odd if Helene would borrow from a jeweller for such an important day in her life while she could easily ask her sisters for some earrings.
Thank you! I will add your info to the blog post.