This entire thing is silly. Gold is a commodity. A gold bar is simply a unit of trade in a specific sub market. There's not enough volume for gold bar trade to

This entire thing is silly. Gold is a commodity. A gold bar is simply a unit of trade in a specific sub market. There's not enough volume for gold bar trade to be liquid. So gold bar market is a market of mattresses before the ship in a tube mattresses showed up. Dealers that trade gold pretend that Gold Bar X is More Valuable Than A Gold Bar Y which is why it is priced higher. The real reason is that dealer feels the dealer can extract more money from a customer and the dealer happens to have Gold Bar X. Customers of the sucker variety think that by paying for Gold Bar Brand Y more than equivalent Gold Bar Brand X they are getting "more value". The thing is that the spread between bid/ask of a single gold bar is much higher than the delta in price of a Gold Bar X and a Gold Bar Y. This has been the case for at least last twenty years.