Research works on the painted decoration inside the mosque carried out in the 1964/1965 revealed five painted layers dating from various periods.[3] The oldest and extremely valuable decorations of the first layer date from the 16th century (in the dome, on the cornice and pendentives, the base of the corner calottes, the mihrab and the lunettes of the lower row of windows), belonging to the group known as Rumi ornament, which were also to be seen in the Aladža mosque in Foča.