It sounds like a plot straight out of Leonardo DiCaprio's 2006 thriller "Blood Diamond," only this drama is very real -- and the cast includes troubled supermodel Naomi Campbell, actress Mia Farrow, and Liberian warlord Charles Taylor.

A "Nightline" report on April 22 claimed that Campbell is refusing to testify at the war-crimes trial of former Liberian president Taylor, who allegedly gave her a large, uncut blood diamond in 1997, when both were in South Africa as overnight guests of Nelson Mandela, The New York Post reports.

Farrow, who was also a guest, told "Nightline" she heard the news at breakfast: "Naomi Campbell came down . . . she said during the night some men had knocked on her door and she, half-asleep, had opened the door and it was representatives of President Charles Taylor, and that they had given her a huge diamond."

Prosecutors say Taylor was in South Africa at the time to buy weapons for Sienna Leone rebels with the precious gems, and, according to "Nightline," Farrow's information about Campbell helps tie him to the purchase.

"That is totally incorrect," Taylor says of the allegations, in videotaped footage from his trial.

About 50 victims of the violence plan to testify against Taylor, but Campbell refuses to cooperate. "I didn't receive a diamond, and I'm not going to speak about that, thank you very much," she told ABC News at the Fashion for Relief Haiti event during Fashion Week.

Asked if she had dinner with Taylor, Campbell grows steely and replies, "I had dinner with Nelson Mandela, thank you very much." Pressed further about whether Taylor's men brought her a diamond, Campbell goes silent then ends the interview with a "Thank you very much, goodbye," before slamming the camera to the floor.

WATCH THE NIGHTLINE SEGMENT HERE


For her part, Farrow is certain that Campbell was given the priceless pink rock. "You don't forget when a girlfriend tells you she was given a huge diamond in the middle of the night, said the actress. There's no doubt in my mind. All I thought was, 'Gosh, what an amazing life Naomi Campbell has. Probably lots of men are always giving her diamonds.'"

In fact, Farrow tells ABC News of the blood diamond, "She said she was going to give it to Nelson Mandela's children's charities." However, the director of donor relations for the Nelson Mandela Children's Fund told ABC News there was no record of Campbell giving the charity a diamond; she did, however, make $50,000 cash contributions that year and the year after.


Taylor's trial, which has been underway for three years, is expected to conclude at the end of 2010. Prosecutors say there's still plenty of time for Campbell to have a change of heart and cooperate. And Farrow, who wants to bring attention to Taylor's diamond-fueled crimes, certainly hopes her friend won't remain silent.

"Step up and do your part," Farrow urged Campbell. "I'm eager to see the people of Liberia and Nigeria see justice. They need that."