Grace Mugabe is suing a Zimbabwean newspaper for publishing claims, released by Wikileaks, that she made "tremendous profits" from the country's diamond mines.
BBC News says the president's wife is demanding $15m from the Standard newspaper.
Army commanders and allies of President Robert Mugabe have been accused of profiting from diamond sales.
The Marange fields are said to be among the world's richest.
Army commanders and allies of President Robert Mugabe have also been accused of profiting from diamond sales.
It quoted a US diplomatic cable released by WikiLeaks.
Mrs Mugabe's lawyer called the reports "false, scandalous and malicious".
CONTRIBUTE TO THIS STORY
