The most important question ( If I am going to invest ) , you can buy bullion but then sell them extremely difficult , the same with coins , with coins a little easier as they are considered collectible goods but buying bullion you can sell them only in the bank in which you bought them , selling to another bank not where you bought bullion from you will require a huge discount and do not forget that without papers that you bought it you will not be considered as the owner of this gold ) ) all very difficult .