Confirming Authenticity Of Gold Ingot Button

My LCS does it for free if you're even an occasional customer.

...nor an XRF test, since the x-rays can't penetrate very far through gold. If the gold wrapper is more than 1mm thick, a regular handheld metal-checking XRF won't see deep enough to spot the tungsten. Even the top-model highest-power XRF analysers can't see through more than 2mm of gold. You'd need gamma rays from a nuclear reactor, or take it to CERN and put it in their particle collider in order to generate radiation powerful enough to see straight through it. I don't know if making a tungsten-cored fake button ingot would be easier or harder than making a fake "chocolate bar" ingot.

You can check for non-tungsten base-metal fakes easily enough with the scale - assuming it's a 1 ounce button, does it actually weigh exactly one ounce, and if it does, is it significantly physically larger than another ounce of gold you happen to have lying around? A specific gravity rig can also give you peace of mind; even a rough and ready rig can tell the difference between an ounce of gold and an ounce of gilt brass.

Don't get overly paranoid. As Sap said, what are the weight and dimensions? If the weight and dimensions are good, and the bar has no obvious signs of tampering, then it's fine. It's supposed to be 19x19x5mm. An ounce of gold is very small and very dense. The tungsten worry is almost too remote to even consider. Just check the above and put your mind at ease.

Here's some pics (in the link): https://www.perthmint.com/shop/bull...ld-cast-bar/