It is surrounded at its upper part by 139 lusterware tiles (with a metallic sheen), each one is 21.1 centimetres square and they are arranged on the diagonal in a chessboard pattern. Divided into two groups, they are dated from the beginning of the second half of the ninth century but it is not determined with certainty whether they were made in Baghdad or in Kairouan by a Baghdadi artisan, the controversy over the origin of this precious collection agitates the specialists. These tiles are mainly decorated with floral and plant motifs (stylised flowers, palm leaves and asymmetrical leaves on bottom hatch and checkered) belong to two series: one polychrome characterised by a greater richness of tones ranging from light gold to light, dark or ocher yellow, and from brick-red to brown lacquer, the other monochrome is a beautiful luster that goes from smoked gold to green gold. The coating around them is decorated with blue plant motifs dating from the eighteenth century or the first half of the nineteenth century. The horseshoe arch of the mihrab, stilted and broken at the top, rest on two columns of red marble with yellow veins, which surmounted with Byzantine style capitals that carry two crossbeams carved with floral patterns, each one is decorated with a Kufic inscription in relief.