Say you're an ethical consumer. You don't want to own diamonds associated with the atrocities you saw in the movie Blood Diamond. So you buy from BrilliantEarth.com, or another seller of Canadian stones. There's no civil war in Canada. You've made the principled decision, right?Not necessarily. Global Witness and Partnership Africa Canada, the two nongovernmental organizations nominated for a Nobel Prize for their work on conflict diamonds, have called that logic “backwards,” because it hurts Africa by effectively boycotting its diamonds.What about lab-grown (aka synthetic or cultured) diamonds, which also are conflict free and don't involve ripping up the ground? They're hailed by Web sites like greenKarat.com, which opposes all diamond mining, including Canadian mining. Aren't they more ethical?Not really, says Estelle Levin, a sustainability expert studying the diamond industry fo