What is the market structure for conflict diamonds?

The market structure for conflict diamonds is the same market structure that exists for any illegal materials.

Trades probably take place at gunpoint, or under the threat of death should something about the transaction disturb any party involved; the general laws of supply and demand work here, too; usually a transaction exchange amount has been worked out in advance of the physical exchange; carnage, mayhem, death and disfigurement generally accompany such market operations.