The Zimbabwe Independent last week reported that the car is black with a white interior and was paid for in cash. It was reportedly yet to be collected and registered as a South African vehicle.
"Grace sent someone to pay R5.8-million in cash for the car‚ a Rolls-Royce 2017 Ghost model. The car is currently parked in the basement of Rolls-Royce Motor Cars‚" the paper quoted a source.
Sources say one of Mugabe's Sandhurst houses is undergoing renovations.
"When renovations are finished‚ the property would be one of the most luxurious homes and most secure in the area‚" the source said.
Her spokesperson Olga Bungu was not available for comment.
Meanwhile‚ President Robert Mugabe is in South Africa for the South Africa-Zimbabwe Bi-National Commission (BNC) in Pretoria but his wife didn't make the trip to South Africa‚ avoiding a sideshow linked to her assault of model Gabriella Engels in August.