LEIDSCHENDAM, Netherlands — Naomi Campbell told Mia Farrow that she received a “huge diamond” from the former president of Liberia, the actress said from the witness stand Monday, contradicting the model’s testimony that she didn’t know the value of the gift from accused war criminal Charles Taylor.

The prosecution called Farrow, and Campbell’s former agent, to testify about uncut diamonds that Taylor allegedly gave the model after a September 1997 party they all attended that was hosted by then-South African President Nelson Mandela.