( CNN ) -- War crimes prosecutors Thursday asked a court to order supermodel Naomi Campbell to give evidence in the trial of former Liberian President Charles Taylor . They said Campbell received rough diamonds from Taylor , and claimed her testimony would prove that the former president `` used rough diamonds for personal enrichment and arms purchases , '' according to papers filed with the U.N.-backed court . Campbell has said she does not want to be involved in the case , prosecutors said , forcing them to ask the court to issue a subpoena ordering her to appear . `` Her anticipated evidence rebuts the accused 's testimony that he never possessed rough diamonds , '' prosecutors said . Prosecutors said they learned last June that Taylor had given the supermodel a diamond in South Africa in 1997 . The actress Mia Farrow confirmed it , they said . `` Ms. Farrow was present at the reception where the accused met Ms. Campbell and was told the next morning by Ms. Campbell about the gift , '' they said in the court papers . Campbell 's lawyer did not respond to repeated prosecution e-mails and phone calls earlier this year after The New York Times reported that Campbell was cooperating with the prosecution , court papers say . She was confronted on Oprah Winfrey 's television show with the accusation that she had received a diamond from Taylor , and did not deny it , prosecutors said . `` I do n't want to be involved in this man 's case -- he has done some terrible things and I do n't want to put my family in danger , '' they quoted her as saying . Campbell did not immediately respond to CNN request for comment about the case . Taylor , 62 , has been on trial for nearly three years . He is accused of fueling a bloody civil war in Sierra Leone that led to widespread murder , rape and mutilation . The war , which involved riches from the diamond trade , was fought largely by teenagers who were forced to kill , given addictive drugs to provoke violent behavior , and often instructed to rape and plunder . Taylor denies the charges . `` I am not guilty of all of these charges , not even a minute part of these charges , '' he said in the first day of defense testimony last July . `` This whole case is a case of deceit , deception , lies . '' The trial is being held at the Special Court for Sierra Leone , in The Hague , the Netherlands . The court was set up jointly by the west African country of Sierra Leone and the United Nations . The court did not immediately respond to a CNN e-mail about when it would rule on the prosecution request for a subpoena , or what power it would have to enforce it . The prosecution also asked to be allowed to reopen its case or to present the Campbell and Farrow testimony in its rebuttal . The case is now in the defense phase .
Prosecutors of Taylor say supermodel got diamonds from former west African president . Campbell will not testify voluntarily , they say . Charles Taylor faces war crimes charges in special court over brutal war in South Africa . He denies charges .