Mpofu said Zimbabwe had won approval to start selling the gems after a Kinshasa Intercessional Kimberley Process meeting last week.
Process chairman Mathieu Yamba said the watchdog had decided to lift a ban on the exportation of diamonds from the Marange region.
But US State Department spokeswoman Victoria Nuland denied the Kinshasa Intercessional had achieved consensus.
“The chair circulated a text to participants which did not attract consensus,” she said. "We believe that work toward a solution must continue, and that until consensus is reached, exports from Marange should not proceed.
The US believes that progress with respect to exports from the Marange area of Zimbabwe can occur solely through a mechanism agreed to by consensus among KP participants.”
Nuland said the US welcomed the collaborative efforts toward effective diamond sector governance demonstrated during the intercessional by countries including the Central African Republic, Ghana, Guinea and Liberia.
Rights groups have called for a ban on Zimbabwe to curb illegal mining in poorly secured fields in the country’s east.
Post published in: Africa News