Irrevocably dirty

Charmian Gooch, a Founding Director of Global Witness, said: "Nearly nine years after the Kimberley Process was launched, the sad truth is that most consumers still cannot be sure where their diamonds come from, nor whether they are financing armed violence or abusive regimes."

[...]

Global Witness' departure seals what has been apparent for some time: that, as an industry, the diamond business can't help but be irrevocably dirty.
-- The Return of the Blood Diamond

Don't buy diamonds.