I know blood diamonds are awful and everything, and that everyone would like to think that nobody would ever want one, so they would become anathema, but I couldn’t help but think of some circumstances where they might be desirable. Like, say you’re a hit-man who’s marrying another assassin; wouldn’t a blood diamond be more appropriate for your nuptials? And what about if you’re a big drug-lord in Mexico, and your lady loves you for killing so many people as ruthlessly as you do: Do you really think she’d want a clean diamond that’s not stained with the blood of the innocent? Surely she’d want a blood diamond, right?
When you think about it, there’s got to be some underground market specifically for blood diamonds, right? So like there’s some Mafia guy who wants to impress his bloodthirsty girlfriend, and they’re looking at diamond earrings or something, and he'd like to dazzle her: He might ask the guy: “Hey, do you have any of those ‘blood diamonds’?” Because discriminating murderers and sadists will accept nothing else! With so much blood on their hands, how could they accept less on their diamonds? After all, they really ought to match, don’t you think?
Hey, maybe they need a new ad campaign to help sell them to that market of miscreants and murderers? They're still allowed to sell cigarettes, after all...