How to buy an ETF and invest in Physical Gold in IRA: Open a brokerage account. You'll need a brokerage account to buy and sell securities such as ETFs and invest in Physical Gold in IRA. Search and compare ETFs with selection tools to find the best option for investing in Physical Gold in IRA. Now that you have your brokerage account, it's time to decide which ETF to buy that will help you invest in Physical Gold in IRA. A beginner can also take advantage of the seasonal strength of gold by purchasing units of a popular gold ETF, such as the SPDR Gold Trust (GLD), in late summer and closing the position after a couple of months.