The bank did not explain its decision.
Belarus is in talks with Russia on a $3 billion bailout package that Minsk hopes will help it avoid a painful devaluation of the rouble and offset the large current account deficit.
Belarussians bought 470 kilograms of gold from the central bank last month, up from 209 kilograms in January and February together, as they sought to protect their savings.
Analysts say that Belarus will have to eventually devalue the rouble by about 20-30 percent even if it receives aid from Moscow. However, the central bank has said it would not make any such moves until late April.