Regardless of the form of gold you choose, most advisors recommend that you don't allocate more than 10% of your portfolio to it. Any form of investment entails risks. Precious metals don't pay dividends: physically owning gold and silver or other precious metals doesn't provide an opportunity to earn dividend income. This is a very common debate regarding these investments, as investments in dividend-paying stocks can offer investors an opportunity to accelerate portfolio growth.
That said, many so-called “experts” recommend investing in stocks, with an investment of 30 to 40% in precious metals. It is generally said that between 10 and 20% of that amount should be in gold and silver each, although that depends on you. This assignment may be a little more confusing if platinum, palladium and other metals are also considered.