British supermodel Naomi Campbell can be called to give evidence over a “blood diamond” prosecutors say she was given by former Liberian president Charles Taylor, the Sierra Leone war crimes court has ruled. Prosecutors at the Special Court for Sierra Leone sought in May to call Campbell, who has so far refused to testify, saying she can provide “material evidence” to rebut Taylor's claims that he never possessed rough diamonds. In a ruling on Tuesday, the court allowed the prosecution to present testimony from Campbell, modelling agent Carole White and US actress Mia Farrow, saying this should be done assoon as possible before the close of the defence's case. In January, prosecutors said that during a visit to South Africa in 1997 Taylor gave Campbell a large rough cut diamond following a dinner hosted by Nelson Mandela. Prosecutors say White heard Taylor say he was going to give Campbell some diamonds and was there when Campbell received them, while Farrow attended the reception where Campbell met Taylor and was told by Campbell about the gift the next morning.