Diplomático rums are made from sugar cane molasses and sugar cane honeys; molasses is used to produce light rums and the sugar cane honeys for more complex rums. The distillery sources molasses with a high concentration of sugar, but with a low ash content and low viscosity.
DUSA cultivates and maintains its own yeast strain, which is used to convert the sugar into alcohol. Light rums made from molasses require a short fermentation, around a day. Intermediate and complex rums that are made from sugar cane honey, however, will take two days to ferment.