1 oz of gold has its own price. That price fluctuates.
On all the mint coins there is a dollar amount in which you can redeem you metal for said $ amount
But usually these amounts are FAR lower than the market value of the metal.
Unless something drastic happens, where you can redeem dollars for cents of a new fiat currency, I don’t see the price of gold EVER going down to $50
There is this silver 1 oz coin that has a $200 mint value but I never understood why anyone would want that. You’re basically storing $200 worth of fiat into that coin which you could have just bought a bunch of silver coins.