Conflict Diamonds

Conflict diamonds.

A) Are those mined in countries as a principal source of revenue for weapons for use by rebels in opposition to sitting governments
B) Are those that display two different colors depending on the direction in which they are viewed
C) Are those that represent the primary assets of a country that are surrendered to the victor in a war between nations
D) Are those that have a substantially reduced hardness in one crystal direction in comparison to other crystal directions