The U.S. jewelry industry is gearing up to counter any negative effects from the upcoming film "The Blood Diamond" which shows how illicit gem trade fueled bloody civil wars, a trade group said.

The film stars Leonardo DiCaprio as a South African mercenary jailed for smuggling in Sierra Leone, ravaged during a brutal civil war lasting until 2002 that killed 50,000 people.

The picture started filming in February, but Warner Brothers has not said when it will be released.

Find out more about jewelers' reactions concerning "The Blood Diamond" movie at reuters.com.