A gold bar that should have weighed 1,000 grams, weighed 2 grams too little. The owner had it cut in half to reveal that the certified, stamped bar with serial numbers had tungsten rods inserted all the way through it. Tungsten, has a density of 19.35 g/cm3, so is a near-perfect match for gold (19.32 g/cm3) and it sells for just one ten thousandth of the price.
The gold bar was cut in half to reveal the tungsten rods.
The problem of fake gold bars By Felix Salmon March 25, 2012You don’t need to be a conspiracy theorist to find this worrying: a 1kg gold bar, certified as 99.98% pure by XRF (X-ray fluorescence) tests, turns out to have been drilled out and largely replaced with tungsten. This bar was discovered only because it was 2 grams lighter than it ought to have been: the forgers failed to add quite enough gold to the outside of the bar to make up for the weight lost when they replaced gold with tungsten. But if they’d gotten the weight right, it would probably still be circulating today.
[Reuters]
Is this a big issue? Who knows? Gold bars are rarely audited. [...]