An x-ray discovered the hiding spot.
A man attending a gem exhibition in Sri Lanka was arrested for swallowing a diamond worth about $13,000. Authorities gave him a laxative to recover the loot. That's when they discovered that the diamond he'd swallowed was fake.
Police believe the man's accomplice has the real diamond, and the arrested man swallowed the fake as a ruse.
Sri Lankan Diamond Saga: Swallowed Gem Was Fake, ABC News>>