9. The Moussaief Red Diamond – $7,000,000
Rumors say that a farmer in Brazil discovered the $7 million Moussaief Red Diamond in the Abaetezinho river back in 1990. The river had the rep for being known as a source of many incredible diamonds. They say this is a 13.9 carat diamond. Imagine doing some fishing or going for a swim and coming out of the water with this magnificent specimen.