About $2-billion worth of diamonds have been stolen from Zimbabwe's eastern diamond fields and have enriched President Robert Mugabe's ruling circle.
Kimberley Process-approved diamonds from Chinese-Zimbabwean venture Anjin will be put on sale on Friday, despite criticism from Human Rights Watch.
Zimbabwe's opposition party claims that illegal trading is costing the country billions.
Susan Shabangu took a "suicidal" position when she officially declared that Zimbabwean conflict diamonds were tradeable, according to activists.
An ally of President Jacob Zuma has been accused of breaching Kimberley Protocol by buying Zimbabwe stones.
The global diamond industry has controversially cleared the way for President Robert Mugabe's regime to raise millions of dollars from exports.