Slightly under a metre long and tapering towards its missing lower end, its edges chamfered smooth, the stone carries two incised figures side by side: a man and a woman, both dressed in ordinary civilian clothing rather than ecclesiastical robes or armour. The woman holds a four-armed floriated cross, a decorative form with leaf-like terminals, with a knop, a small rounded protrusion, beneath the cross-head. She wears a veil and a mantle over a gown with tight sleeves. The man beside her has short hair curling below the ears, a tunic with tight sleeves, and over it a supertunic with a round neck. There is nothing about either figure that immediately declares who they were.

Scholars have dated the slab to the first half of the fourteenth century, based on the style of dress and carving. Because Athasselabbey was an Augustinian foundation, one theory put forward is that the two figures represent St Augustine of Hippo and his mother St Monica, a pairing that would have carried obvious significance for a community following the Augustinian rule. The suggestion appeared in print as recently as 1985, but it has not found firm footing: other researchers have pointed out that there is simply no solid evidence to support the identification, and the civilian dress of both figures sits awkwardly with a saintly reading. The identity of the man and woman carved into this tapering stone remains, for now, unresolved.