The gold bar with the lowest price is the 1 gram gold bar. An important note here is that production costs are often very low with such small gold bars, so it is generally wiser to buy a gold bar in a higher weight. The cheapest gold bar in relation to the gold price is the 1 kilogram gold bar. This is a gold bar that can be bought at a premium of typically only 1% above the gold price. This makes it the gold bar with the lowest price per gram. However, the size of 1 kilogram is such that the 1-kilogram gold bar is a very expensive product and represents a market value of currently around €69,000.