DeBeers and the Russians were the world's main suppliers of jewelry diamonds, and they deliberately kept the price up. When wars broke out in some diamond-producing areas, the two oligopolists feared a crack in their oligopoly, undercutting their prices.
In a stroke of PR genius, they coined the term "blood diamonds." They could shut off the competition if they got the "good people" to spread their propaganda that "blood diamonds" paid for war. With this movie, it seems to have worked.
Joe, you're a genius.
I told my son the same thing when he was visiting for Christmas.