Gold coins are impossible to counterfeit. Try searching the internet for an example of a fake coin that has the proper size and weight. It doesn't exist. This is because gold is way heavier than everything else except tungsten and uranium. Uranium is more expensive, and tungsten is too brittle to stamp with an image. You can only use tungsten to make fake gold bars because those aren't stamped. You can verify a gold coin with a cheap plastic scale.
Unfortunately, gold bugs don't realize that gold isn't used to transact any more, not because of regulation, but because it sucks compared to digital currency because you can't spend it at a distance to buy things online. Using a gold-backed debit card puts you back in the same position as government currency because you have to trust the issuer that your gold is there, and you are actually just using digital currency to pay. Bitcoin was the first digital currency to eliminate this counterparty risk.