Meet the art collectors with home galleries: 'The stock market doesn't give me any fulfillment'

Multimillionaire Grant Cardone, who has been collecting art for around 15 years, says he's a spontaneous buyer.

"I don't consider myself a connoisseur. I'm very new to the art world. If I like it, I buy it. I don't care who did it," he told CNBC. Alongside pieces displayed throughout his home, Cardone also has an art gallery to house his considerable collection.

CNBC spoke to Cardone by video call — behind him in his Miami home office was an untitled piece by American graffiti artist Retna that Cardone bought in an online auction.

"I clicked the button — really hadn't done any research … and got the piece … And it got here and I absolutely freaking loved it," he said. He paid "maybe $140,000" for the work, he said.

Along a corridor in Cardone's home are two pieces by American pop artist Burton Morris, both depicting red Coca-Cola bottles lined up in a repeating pattern named Coca-Cola 50A and Coca-Cola 50B. "This I bought from Tommy Hilfiger … it reminds me of the importance of scaling," Cardone said — fashion designer Hilfiger is the home's previous owner.

Cardone, a real estate investor and author of "The 10 X Rule: The Only Difference Between Success and Failure," has around 17 million followers on social media and uses his platforms to give occasional advice on art investing.

"[Followers are] starting to see the art saying, hey, you know, [has] that been good for you? And I'm like, yeah, it's good for me … It's better than the dollar or the euro … The stock market doesn't give me any fulfillment, I don't go back and look at my Apple shares and feel good about it. But I walk in my gallery or down the kitchen or in my office and I see a piece and I'm like, man, it's super cool."

Inside Cardone's gallery — complete with