Want a quick way to find some quality investments? Take a look at Berkshire Hathaway's portfolio. It contains many solid companies that some of the world's smartest investors, including billionaire Warren Buffett, have vetted.

Three stocks that are not only solid investments in that portfolio but have also doubled in the past five years are Apple (NASDAQ: AAPL), T-Mobile US (NASDAQ: TMUS), and Mastercard (NYSE: MA). Let's see what the future portends for them now.

Apple is a favorite of Buffett's, and for good reason -- the company is a money-making machine with a loyal customer base. The company's revenue has soared and profits have risen at an even higher rate over the past five years, which has made the tech stock a hot buy for investors.

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Source Fool.com