The committee has ordered Mugabe to face legislators over his previous pronouncements that the state had been deprived of at least $15bn in diamond revenue by mining companies.
Mugabe said in March 2016 that the country was robbed of the revenue by diamond companies, including joint ventures between Chinese companies and the army, police and intelligence services, whose operations were shielded from public scrutiny.
Specifically, he said Zimbabwe lost $15bn from the Marange diamond fields, more than 400km east of the capital. He later expelled the companies and replaced them with a state-owned diamond company.
Mliswa said a new date for Mugabe to testify would be set. The questioning on Wednesday would have been Mugabe’s first public appearance since the army deposed him last November in a de facto coup.