A top-of-the-line tungsten alloy fake gold rod should match the color, surface hardness, density, chemical, and nuclear properties of gold perfectly.
To do this, you could start with a tungsten slug about 1/8-inch smaller in each dimension than the tungste fake gold rod you want, then cast a 1/16-inch layer of real pure gold all around tungsten fake gold rod.
This is would feel right in the hand, it would have a dead ring when knocked as gold should, the product would test right chemically, it would weigh exactly the right amount, and though I don't know this for sure, I think tungsten alloy fake gold rod would also pass an x-ray fluorescence scan, the 1/16" layer of pure gold being enough to stop the x-rays from reaching any tungsten. You'd pretty much have to drill it to find out it is fake.
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