Making diamonds with a blowtorch

Help

Natural diamonds are formed in the intense pressure and heat of the Earth's mantle at depths of over 100km.

Jem Stansfield attempts to grow diamond crystals, using the heat of an oxy-acetylene welding torch.

A new series of Bang Goes the Theory starts on Monday, 15 August 2011 at 19:30 BST on BBC One. Watch more clips or catch-up via iPlayer at the above link.

Please note: The experiment is extremely difficult to perform, requires expert guidance and the tiny diamonds produced are too small to be of commercial value.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.