That's one way to put your money where your mouth is.
A Canadian man suspected of swallowing a diamond is being held by the police until it passes through his system, according to the BBC.
The 1.7-carat diamond, valued at $20,000, was allegedly swapped by Richard Matthews for a fake one, while he swallowed the real one.
Sgt. Brett Corey told the Associated Press on Thursday that an x-ray showed a pair of fake diamonds also inside Matthews, though the real diamond was not detected because it is translucent.
Corey told the Toronto Star, "He is making every effort possible as are we," to pass the diamond.
More on GlobalPost: Beau Sancy diamond sells for $9.7 million at Swiss auction
The 52-year-old Matthews was arrested at Precision Jewelers on May 10, and surveillance video showed him swallowing the diamond.
The Toronto Star reported that Matthews is being held in a "dry cell" with no available plumbing, only a bucket. Each time he... goes... the contents are examined to find the gem.
The BBC said initially Matthews was fed a fiber-rich diet, but now is eating whatever he wants in hopes that he will pass the diamond.
Matthews has been charged with theft and breaching his probation, according to the Toronto Star.
More on GlobalPost: Horse rescued after swimming 2 miles out to sea in California