A Profoundly Superficial Question(Jewellery)

Toward the end of the movie,just after Jeremy Irons son goes for the long goodbye, you see Juliet Binoche walking away from the scene of the accident.She is wearing a black dress. The clothing on the women in this film comes from the design firm Christian Dior.She is also wearing a silver coloured necklace which looks like choke chain for a fairly large dog. The big important question is: did anyone see which company provided the jewellery?