You can trust on bullion as much as governments trust in its value or worth.
There will only be slight differences between the variations or types of gold bullion. Gold may be fashioned into bars, nuggets, biscuits, rounds or minted coins. These types of bullion also vary as to weight. Compared to a bar of gold, you might want to ask how much is a gold coin worth? As to ounce per ounce, bars of gold are cheaper by about fifty US Dollars. 100 gram gold bar