Home Video Zimbabwean diamonds to contribute $1 billion a year by 2023. Video Zimbabwean diamonds to contribute $1 billion a year by 2023. By Jeoffrey Ncube - March 27, 2019 1789 0 FacebookTwitterPinterestWhatsApp Mines and Mining Development Minister Winston Chitando revealed that the country’s mining industry is destined to increase in size with diamonds alone expected to contribute $1 billion a year by 2023.