Many investors are familiar with the emerging markets story, especially with the MSCI Emerging Index's 70% or so gain so far this year. But beyond emerging markets, Sri Lanka and Kazakhstan are examples of frontier markets that have seen more than 100% gains year to date. Emerging markets guru Mark Mobius has dubbed these countries "tomorrow's emerging markets".

In the first of a three-part series on Closing Bell, Maria Bartiromo discussed the risks and rewards of investing in frontier markets with our panel of guests.