Maby some correlation between Gold, Diamonds, S&P500 and NASDAQ?

FX:XAUUSD   Gold/U.S. Dollar
If we look at the figure we are seeing some high correlation between the Forex Gold             and Diamond versus the Futures S&P500             and Nasdaq.
Prediction: this month Gold             , Diamonds, S&P500             are going down
Prediction: this year Gold             , Diamonds, S&P500             and NASDAQ are going up
How is it possible that there is some correlation between them? (my opinion)
You mostly find gold             and diamnonds in the same country, mostly concentrate in Africa, South-America.
The S&P500             is correlated to Diamond and Gold             companys because the S&P500             is a comparing of company's that are the most important in the US. If stocks of dollars and euro's are fall we can predict that the stocks of forex in Gold             are rising, and because we know also that Gold             is correlated to Diamonds we can assume that Diamons are going to be more value in the market.
Now we have one thing to understand: why the NASDAQ is correlated between these markets?
The answer at this could be something like: ''the NASDAQ is correlated because, we know that The S&P500             is a combination and comparing between the most important company's in the US. The US has some of the most powerfull and valuefull Electronic Company's. So When the S&P500             is rising (or falling) there is always some correlation in the market between them.

information: Bloomberg terminal, Wiki, is correlation one of the most important things in trading?
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