The chapel is split in 3 naves, separated by granite and marble columns with composite capitals, which help 5 ogival strings for each facet. The chapel is likely one of the finest preserved Medieval monuments as a result of there are totally different types that coexist: the marble ornament in opus sectile, marble inlay of the flooring and partitions, the Byzantine mosaics of the presbytery on the aisles, and the Islamic work of the muqarnas (ornamental approach aka “honeycomb”). The mosaics symbolize biblical figures, geometric shapes, animals and dancers.