Investing is just as much about learning what to not invest in as what to invest in, and I’ll add GDMN, WisdomTree’s Efficient Gold & Gold Miners ETF to that list. Seems like it would be good for a RP portfolio, but it just isn’t. Check out the backtests, correlations, and my commentary here!
For gold, I use GLDM (SPDR Gold MiniShares) as the representative choice in the test portfolios, and hold it in real life, as well. Low cost (expense ratio: .18%) and simple.