Jim Cramer rejects Wall Street doubts about Nvidia, Apple and Warner Bros. Discovery

CNBC's Jim Cramer on Tuesday told investors that it can be worthwhile to put trust in a good stock, even if a negative narrative about the company is gaining traction on Wall Street.

"If you want to make big money in individual stocks, you need to be a believer," he said. "Sometimes it doesn't pay off — everybody makes mistakes — but if you don't believe in your stocks, then you'll never be able to stick with them through thick and thin."

He reviewed prominent concerns with three major companies: artificial intelligence giant Nvidia, iPhone maker Apple and entertainment outfit Warner Bros. Discovery.

Nvidia has exploded over the past few years as hyperscalers clamor for its advanced semiconductors. The company became the first stock to reach a market cap of $4 trillion earlier this year — and it briefly topped $5 trillion during a session in October.

But investors are worried about the company's business prospects in China due to potential restrictions on sales of its coveted chips. But Cramer reiterated his confidence in Nvidia's success. He noted that President Donald Trump just granted Nvidia permission to sell some of its chips in China, and he suggested there is still demand for them in the country.

Wall Street broadly has had reservations about Apple over the years, Cramer said, but he dubbed the company a long-term winner. He noted that many doubted the success of the company's latest iPhone over the past several months. However, Cramer pointed out that Apple stock has "been on a huge winning streak since September." Shares are currently up more than 10% year-to-date.

Cramer applauded WBD CEO David Zaslov's efforts to pay down his company's substantial debt and refine the HBO streaming service. While Netflix and Paramount Skydance are now locked in a struggle over the company, Cramer suggested many on Wall Street had doubted WBD could attract buyers willing to pay a premium.

"Now the acquirers are here and it looks like what the media originally called a preposterous price was too low," he said.

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Disclaimer The CNBC Investing Club holds shares of Nvidia and Apple.