Gold Roth IRA?

You can use your self-directed Roth IRA to invest in U.S. gold coins in increments of one, one-half, one-quarter or one-tenth of an ounce, one-ounce silver coins that are minted by the U.S. Treasury Department, and some gold or silver bullion as long as the gold and silver meet the IRS requirements. Alternatively you can roll over some or all of the funds in your current IRA or 401(k) to purchase a gold IRA, which is an IRA account that specifically invests in gold coins and bars instead of mutual funds and stocks.

Ref.: Investopedia 

roth iras gold

Roth IRA Example #1

You are 25 years old and looking to begin investing in an IRA but are unsure whether to invest in the Roth IRA or the traditional IRA. You earn $55,000 a year, live below your means, and can invest the maximum allowable contribution of $5,500. Let’s see how this one-time investment plays out:
A one-time investment in the traditional IRA of $5,500 receiving 12% interest for 35 years (the earliest available time for withdrawing) would compound to $290,399. If you begin to withdraw the money, it will get taxed at the current tax rate. Maybe you are working a job, getting some social security, and you take out 10% of the traditional IRA. If taxes remain the same as today (which will not happen), you could easily be taxed 25% on your withdraw. Your first 10% withdraw would be $29,040 in which you would pay $3,902 in taxes and reduce your withdraw to $25,138. On the other hand, if you would have invested in a Roth IRA you would pay no taxes (assuming the government has not changed the Roth rules).
The next step is deciding what to do with the money you save at the age of 25. With your $5,500 contribution to your traditional IRA that year, you would have saved $1,375 in taxes. Now you could either take a vacation, buy something nice, or you could invest these savings. The exciting thing about investing this money is that it can completely transform the outcome of what your retirement looks like. For example, investing that $1,375 into a different retirement account would grow to $76,598. Thus, with this simple investment from your tax savings at the age of 25, your retirement nest egg has gone from $290,399 in a Roth or traditional IRA to $367,000 when you add in your additional retirement account! Small changes today have enormous impacts on your future later.
If you wanted to take 10% out of your retirement, you would withdraw $29,040 from your Roth IRA or $36,700 from your traditional IRA and additional retirement account minus the $9,175 in taxes leaving you with $27,525.

Example #2

In the first example, we looked at a one-time investment and how much money can accumulate with just a single investment. So, with the right investment strategy, you do not need to contribute extravagant amounts of money annually to become very wealthy in the long run. In this second example we are going to look at the same scenario, however instead of a one-time contribution, it will be the same contribution every year for 35 years.
If you contribute $5,500 per year for 35 years averaging 12% returns, you will have an incredible $2,659,047 at the age of 60! If you also had invested the $1,375 tax savings into a separate retirement account which also received 12% returns that fund will have accumulated to $664,762. Your total traditional IRA plus your additional account would be worth $3,323,809 versus your Roth account of which is still at $2,659,047. Now withdrawing 10% each year leaves you with a sizable income. If you were to take 10% out you would receive $260,590.47 from your Roth, or you would receive $323,381 minus the $90,574 in taxes. Also, because your income is substantially larger, you are now in a much higher tax bracket. After taxes, you would be left with $232,807.
Keep in mind that your investments will continue to grow as you take distributions. If you continue to receive 12% on your funds, your traditional IRA, because it is larger, would grow more than your Roth IRA.

Example #3

Earlier we discussed that RMD’s (required minimum distributions) are mandatory for the traditional IRA at 701/2 years of age whereas the Roth IRA does not have an RMD. Let’s say you are 25 years old and will not withdraw until it is required. You contribute the maximum amount of $5,500 each year, and you take the tax savings of $1,375 and invest that as well.
Over the course of 45 years, your nest egg would have grown to an astonishing $95,369,126. Your additional investment account would have grown to $23,842,285 thus leaving you with a total of $119,211,411. Now in your traditional IRA account, you would be obligated to take the RMD amount of $4,350,781.42. This amount would almost certainly place you in the highest tax bracket, which currently puts your federal tax rate at 39.6%. On the $4,350,781.42 that you withdraw from your traditional IRA you would be taxed $1,679,955 leaving you with $2,670,826.42. The formula for required minimum withdraw in percentage terms was 3.65% withdraw. If you were to withdraw 3.65% from your Roth IRA, which is approximate $24,000,000 less than your traditional IRA, it would result in a withdraw of $3,480,630.84.