Swiss authorities said Thursday they had caught a couple from New York trying to smuggle $3.1 million worth of jewelry into Switzerland.
A statement said the couple was stopped at Zurich's airport last week after a random search.
When the jewels were found, the couple said they were the woman's personal possessions and estimated their value at $1.1 million.
A probe showed the value to be three times higher and that the man was a jewelry and diamond trader. The couple then told authorities they intended to sell the jewelry at a luxury fair in the Swiss city of Basel.
The couple was not identified because of Swiss privacy laws.
The statement said they would have to pay a hefty fine for breaching customs law. No amount was specified.