Tendai Biti, the MDC's secretary-general, has been jailed, charged with treason and denied bail.
Finance Minister Tendai Biti's revelation, reported by various media outlets, raised collective eyebrows worldwide.
Police and the MDC confirmed Tendai Biti's arrest and the charges he will face.
Mr Biti, an MDC man, says his treasury has received no diamond revenue at all.
Biti, secretary general of the MDC, was arrested when he arrived in Harare, Zimbabwe, from South Africa.
The lead negotiator for Mr Tsvangirai's side, Tendai Biti, is facing treason charges and is out on bail.
Despite the troika's statement, MDC Secretary-General Tendai Biti said the disagreement extends beyond the Ministry of Home Affairs.
Mr Biti said Mrs Tsvangirai's death had served to "unite us in spirit".
Mr Biti told the BBC's Focus on Africa radio programme that his statement had been deliberately taken out of context.
Finance Minister Tendai Biti, from Tsvangirai's party, has often accused the Marange mines of not remitting diamond proceeds to the Treasury.
Tendai Biti, a fiery human-rights lawyer and the reputed brains behind the MDC, has been given the unenviable post of finance minister.
The government-run Herald newspaper says Mr Biti and Justice Minister Patrick Chinamasa have been given the task of sourcing this money from donors.
MDC's secretary-general, Tendai Biti, has been in prison since his arrest at Harare airport after coming back from South Africa earlier this month.
African and international leaders have criticized Biti's arrest, characterizing it as a ploy by Mugabe supporters to intimidate the opposition party before the vote.
CNN: Official: Mugabe wins re-election after opposition pulls out
African and international leaders have criticized Biti's arrest and the treason charge, characterizing it as a ploy by supporters of Mugabe to intimidate the opposition party before the runoff.
At Tuesday's U.N. hearing, Biti will present evidence the party believes shows Zimbabwe's deteriorating political climate and a government trying to hold on to power, said George Sibotshiwe, a spokesman for Tsvangirai.
Tsvangirai was among the MDC leaders picked up by police ahead of the runoff, and MDC Secretary-General Tendai Biti has been jailed on a charge of treason -- which can carry the death penalty.
CNN: Official: Mugabe wins re-election after opposition pulls out
Having reportedly opposed the original power-sharing deal between Messrs Mugabe and Tsvangirai in September, a harder-line faction led by Mr Biti now hopes to persuade the party to reject the latest one at a meeting of its national council.
The MDC's Tendai Biti, who currently serves as finance minister, told the BBC the document was the "midwife" to a brand new Zimbabwe as it sets out people's rights, devolves some power and sets up a system of check and balances for those in authority.
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