Shares of gold mining company Randgold Resources (GOLD) - Get Barrick Gold Corporation Report are up on Monday despite a downgrade by Morgan Stanley to hold from buy.

But TheStreet's Jim Cramer, co-manager of the Action Alerts PLUS portfolio, said on CNBC's "Stop Trading" segment that Randgold Resources' stock has shown growth and investors should buy it on any weakness.

Noting that the Morgan Stanley ratings cut is the stock's fifth straight downgrade, he pointed to Ramdgold's one-year stock chart and asked investors to consider whether it looks like a stock that has been downgraded repeatedly.

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"What does that tell you?" Cramer asked. "That stock is going higher." 

Gold prices aren't done going up, Cramer added.

"I think gold is a trade out of China pulling money out of their own country and not wanting to put it in dollars, not wanting to put it in yen, not wanting to put it in euros -- putting it in gold," he said. "And Randgold is the best gold miner."

At the time of publication, Cramer's Action Alerts PLUS had no position in companies mentioned.