Nighthawk: African Ice by C. Edgar North

Nighthawk: African Ice is a sequel to Nighthawk Crossing. Wanted by the FBI for murder and smuggling, Joseph Branson, Chief of the Midlake Indian Tribe, flees with his wife Hazel to the Maldives in the Indian Ocean where he is a business partner with Igor Romanoff, one of the world's biggest arms merchants. All this is carefully watched by the CIA. Joseph and Igor begin trading weapons for raw diamonds sourced from conflict zones in Africa (Blood Diamonds - African Ice). They add value by having the diamonds cut and polished. The best stones are sold to investors - which leads to a US Dollars-for diamonds deal with Cocaine processors. In the meantime, Hazel returns to the Midlake Indian Tribe and runs for Chief to replace Joseph. She is opposed. Her life is threatened and she kills.