I had a friend that lost his shirt buying commodities futures. Options are not as risky, but I would prefer some kind of share or actually possessing the stuff.
How I made $125 Trading Index Options in Just Twelve Months.
You might be most comfortable with the gold ETF symbol GLD. Each share is worth one tenth ounce of gold. It has the advantages of owning bullion without the disadvantages. It also does not have the leverage of a well-chosen mining company's shares.