GLD, GDX and DXY - If you actually believe in the intrinsic value of gold, I'm not sure why you would buy it in dollar terms if you think the medium term trend for the dollar is likely down. Why put on a trade when you believe it's half bad?  Every trade has two parts - the currency trade and the asset itself.  If a client asks an FA to buy a stock on the French exchange, it's not problem - easy day on IBKR. You can trade on almost any exchange, but the process is to first do a FX trade (dollars into euros in the case of the French exchange) then purchase the desired equity with the euros. When you track it in your portfolio after purchase, you will always see the p&l of both the equity and currency trades. When it's your home currency you only see 1 p&l for the equity trade but there are still both trades at play. If you have USD savings and a USD brokerage account, you are long USD.  

There are vehicles for buying gold in euro, yen and other currency terms.

https://www.etftrends.com/2015/03/euro-denominated-gold-etf-shines-in-commodity-space/