Hi there,
I emailed the PR company who work for Cadbury and they said the advert was filmed in USA and the necklace was commissioned bespoke out there. The PR person is going to get in touch again if she can find out who the designer was.
Emma
See the email I received below:
Hello Emma,
Thank you for your email. We have been tracking the answer down for you and I am afraid that it was a bespoke piece made for the advert. We have been unable to get the name of the designer (it was filmed in the US) but if we do, we will of course let you know.
Best regards,
Anna Speight