You may be thinking of blood diamonds, which are also known as conflict diamonds.
The economic slaves that dig the diamonds often die getting them. Additionally, the money obtained from selling the diamonds is used to fund civil wars in several African nations.
Flaws in diamonds are called inclusions. They can be of several types, which you can read about, below.
"Conflict diamonds", also called "blood diamonds" is a term coined by pop culture to describe diamonds attained from certain regions in the world where violence is involved in the sale and trade of diamonds.
In some of the more politically unstable central African and west African countries, revolutionary groups have taken control of diamond mines, using proceeds from diamond sales to finance their operations. Diamonds sold through this process are known as conflict diamonds or blood diamonds. Revolutinary groups-
Diamonds made in factories are called man-made diamonds.
Southern African countries are known for mined diamonds, not manufactured diamonds. Sometimes the process of cutting and polishing raw stones is called 'manufacturing', in which case most of this work is completed currently in India, not Southern Africa.
'Small' is relative, so commonly diamonds that weigh less than one-quarter carat -- .25 carat -- can be considered 'small'. Often if several are set in jewelery, they are called accent diamonds.
The term "blood diamond" refers to diamonds that are mined in war zones and sold to finance armed conflict. The name reflects the violence and human suffering associated with these diamonds, as they are often extracted through forced labor and used to fund war and human rights abuses.
Diamonds are called Blood Diamonds (or Conflict Diamonds) when they are mined in war zones and sold to fund armed conflict, often by rebel groups against governments. These diamonds have been linked to severe human rights abuses, including forced labor, violence, and exploitation, especially in parts of Africa during the 1990s and early 2000s. The term highlights the human cost behind the sparkle.
Loose diamonds are called loose diamonds. When set as a group, the term may describe the setting more than the stones, i.e., pave, which is a 'pavement' of diamond stones. Otherwise multiple diamonds are simply called diamonds.
Coal has been called 'black diamonds'. This is probably because coal and diamonds are both formed from carbon.
They are called blood diamonds because the money made from them is used to fund wars and terrorist activities.