Precious gems have been around for centuries, and since the beginning they've been admired and worn by the elite of the world. Hoarded by rulers and looted by opportunists, they signify great wealth and status. Individual gems, inherited throughout generations, have histories of passing between allies and foes, which add to their value and allure. However, many of the world's most notorious stones carry a controversial or mysterious past.
Intrigued? Click on to discover the world’s most controversial gemstones.