London, Jul 2 (IANS): Supermodel Naomi Campbell will be subpoenaed to testify in a war crimes case over the claims that former Liberian president Charles Taylor gave her an uncut 'blood diamond'.

A subpoena is a legal measure used to secure testimony for witnesses who are unwilling to give evidence, reports contactmusic.com.

The 40-year-old will be asked to explain claims she received a "huge, uncut" 'blood diamond' from the former Liberian dictator during a party held at former South African president Nelson Mandela's house in September 1997.

Actress Mia Farrow, who has also been called to trial, has claimed that the model personally told her about the precious stone.

The war crimes trail against Taylor is underway in The Hague, Netherlands and a court spokesperson said: "What it is going to happen now is just a matter of when it happens."

Campbell has repeatedly refused to answer questions for the special court.

"I didn't receive a 'blood diamond' and I'm not going to speak about that," she said in April this year.

Taylor has been on trial since 2008 for crimes against humanity, after a bloody campaign he waged in Sierra Leone (an African country) between 1997 and 2001, during the period he is alleged to have been involved with 'blood diamonds'.

A 'blood diamond', also called a 'hot' or 'war' diamond, is a jewel mined in a war zone and sold to aid warlord activity or invading forces' campaigns.