Ittai Gradel says he sold on some of the gems he thinks came from the British Museum.
A mission to hunt them down leads the team through the backstreets of Paris and to a small town in Germany.
Presenter: Katie Razzall
Producers: Darin Graham, Ben Henderson and Larissa Kennelly
Production Coordinator: Gemma Ashman
Mix and sound design : James Beard
Composer: Jenny Plant
Exec-producer: Joe Kent
Investigations Editor: Ed Campbell
Series Editor: Matt Willis
Commissioning Executive: Tracy Williams
Commissioning Editor: Dan Clarke Show less