Blood diamonds are diamonds mined in a war zone and sold to finance an insurgency, an invading army's war efforts, terrorism, or a warlord's activity. The term is used to highlight the negative consequences of the diamond trade in certain areas, or to label an individual diamond as having come from such an area. Diamonds mined during the 20th–21st century civil wars in Angola, Ivory Coast, Sierra Leone, Liberia, Guinea, and Guinea-Bissau have been given the label. The term conflict resource refers to analogous situations involving other natural resources. Blood diamonds can also be smuggled by organized crime syndicates so that they could be sold on the black market.

A warlord is an individual who exercises military, economic, and political control over a region, often within a country without a strong national government, through usually informal or illegal coercive control over the local armed forces. Warlords have existed throughout much of history, albeit in a variety of different capacities within the political, economic, and social structure of states or ungoverned territories. The term is often applied in the context of China around the end of the Qing Dynasty, especially during the Warlord Era. The term can also be used for any supreme military leader.