The term “blood diamond” refers to diamonds that come from war zones in Africa, and sold (typically illegally) in order to fund insurgent war efforts against legitimate and internationally recognized governments. These rebel factions trade diamonds with illicit arms dealers to fund their military action in opposition to those governments. Millions of deaths are linked to the rebel wars and trafficking of these gems.  They are also linked to rape murder and forced mining practices on workers at gun point.  To say the least, evil and inhumane practices. 

It is important that you know where the diamonds that you are investing in are mined.  This is no reason that you should not enjoy what God placed on the earth.  There are many good diamond mines from which the majority of exclusive  jewelry is mined. Negative information usually forces prices down, which makes it a good time to get in to make a profit.