Marcus meets the Diamond District's go-to gold man

Max Kahan might just be the smartest businessman in the Diamond District. He owns Max Kahan Inc., a business that sells gold to jewelry makers and buys their scraps – which he melts down and sells again. It's the 29th largest New York company in private hands with $742 million in revenue. Catch the sneak peek and don't miss the series premiere of "Streets of Dreams with Marcus Lemonis" Tuesday, December 29 at 10P ET on CNBC.