np.. found a site mentioning, that XAUUSD=X oder XAUEUR=X would show the value of an ounce of gold.. but not really working for me =/
If you are interested in the price of copper -> XCUEUR=X
maybe GC=F ? i am not familiar with stocks/metal/value/stuff, but if you check the source, apple is using for this app (Yahoo), you might find more infos related to this -> https://de.finance.yahoo.com/quote/GC=F?p=GC=F
GC=F is for Dec 20 Gold futures on the COMEX exchange
I don't know how to get the current gold price to display in stocks. Also I don't know how to get the current gold price to display in yahoo finance and that's where Stocks gets its data from, as mentioned above.