Diamonds that come from God knows where. Diamonds have the unfortunate values of being very tiny, very valuable, and generally being mined in places that aren't terribly politically stable. Thus, your average diamond was probably mined by somebody who was not paid to do it, and used to purchase firearms or as part of a drug trade. Terrific, no? So I'm all behind the movement to purchase diamonds that you actually can track their original whereabouts, or even fake diamonds such as moissanite, that actually have a higher refractive index than diamonds. (Sparkly!) But if you're interested in a conflict-free diamond, this store BrilliantEarth has a nice selection. I think that selecting a diamond (especially one that will be worn for hopefully the rest of your life) should carry as much weight as you give to selecting an SRI or what not.