Gold is not fiat.
Fiat money means that is ordered to have value by government or law.
Gold has value because of its properties to be used as jewelry, electronics, dentistry etc but most important its value is because people know other people will accept it as "money". Its a commodity money. Gold has value because the market says it does.
One basic tenant of a fiat currency is that the currency itself has no intrinsic value. People claim that the dollar isn't worth the paper it is printed on because it has no actual value. However, measured by the same status, gold isn't worth much of anything. Once you remove 80% of its demand through jewelry or investing, it is worth far less than 20% considering the supply/demand curve would not be linear.
The dollar is a commodity money also, it has value because the market says it does. It's only value is what somebody else will pay for it. The same exact value as gold.
This is what is hilarious about gold bugs, they think that just because it is semi-rare that it is "worth" something. A Honus Wagner baseball card is extremely rare, people would pay hundreds of thousands, if not millions, for one, but what is it really "worth"? I can only burn it to start a fire, I can't derive any energy beyond that from it, I cannot derive any sustenance from it, I can't shoot it for hunting, I cannot use it to produce work. In fact, it has just as much value as gold or a dollar bill, nothing. It's value is derived from the fact that somebody else places value in it.
Gold falls, solidly, in the Greater Fool theory. Even worse, it has been utterly debautched by the fact that hundreds of billions in futures contracts were created out of "thin air" merely for speculation on gold. Even worse, those futures contracts require very small "principal" to actually create the investment, the margin requirements of 10% means that for every $1 invested, you created $10 in gold demand. Out of thin air. It's effectively a 10% down NINJA loan that creates demand out of thin air. Sure, somebody has taken the "short" side of the contract and that contract only settles higher once physical demand is met, but the problem with that thinking is that it only happens that way if the contract is not replaced on the market AND is not thought to be lower in value in the future (speculated), thus, you can keep the system going in a fiat fashion, forever, out of thin air.
It's not even that great as an inflation hedge but can be inflated to infinity.
Sure, I agree, gold has history working for it. Momentum. However, that history has fallen flat before. What about 1980? What if society just suddenly decides gold is a horrible store of value and a cup of potable water is better? Then what?