Rough Diamond

Always True Crime

A true story of crime, corruption and two impossible thefts.In 1965 the world’s largest uncut diamond is stolen from the Natural History Museum, the man arrested is David Knight, a 24 year old window cleaner who lived just yards away. Now Josie Long tells his extraordinary story. Read more

True crime New

Episodes

Diamond Dave

09/22/2026 30:15The Making of a Thief

09/22/2026 27:43 Introducing: Rough Diamond

09/15/2026 0:57

Our take on Rough Diamond podcast

A true story of crime, corruption and two impossible thefts.

In 1965 the world’s largest uncut diamond is stolen from the Natural History Museum, the man arrested is David Knight, a 24 year old window cleaner who lived just yards away.

Now Josie Long tells his extraordinary story. There was no evidence placing David at the scene, and the police officers who claimed he confessed were far from squeaky clean.

But if he was innocent when he went into prison, he certainly wasn’t on his release. After he walks out of Wormwood Scrubs he embarks on an audacious life of crime, culminating in a famous heist that only a handful of people in the world knew he was responsible for…until now.

Launches September 23rd. Follow now so you don’t miss the first episode, or join the Always True Crime Patreon to get notified when it drops.

An Audio Always and Colenso Films Production.

Produced by Mansi Vithlani.

Executive produced by: Paul Hodgson, Richard Carroll and Ailsa Rochester.

Sound design by Craig Edmondson.

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