The president of the Zimbabwe Miners Federation, Henrietta Rushwaya, who is a niece of President Emmerson Mnangagwa, has been convicted by a court of attempting to smuggle 6kg of gold through the VIP route at the main international airport in the capital, Harare, three years ago.
The court remanded her in custody until 10 November, when she is expected to be sentenced, the state-owned Herald newspaper reports.
Rushwaya had pleaded not guilty.
Two Central Intelligence Organisation operatives, who were charged with her, were acquitted because of a lack of evidence, the newspaper reports.