Mission: Impossible - Season 1 Episode 19 : The Diamond 1973

Henrik Durvard has taken over the country of Lombounda by military coup, and holds the natives in terror. He has obtained a diamond from the native miners, and the IMF are assigned to take it away from him. In London to auction the diamond, Durvard is approached by the team who offer to top all bids if they get exclusive rights to diamond production in Lombounda. Since Lombounda is not known for its diamond production, Durvard is suspicious. Eventually the team lets him figure out that they have a plan to use his country as a blind to distribute artificial diamonds that they claim they can manufacture. Durvard insists on being part of the scam, and forces the team to ""make"" a diamond from him using a piece off of the original stone. They do so, but when it comes time to fake the real diamond, the machine apparently overloads from the strain. The team slips the diamond out of the machine and leaves, as Durvard and the machine blow up.