Carved into its surface is a double Latin cross with triple incised lines, a central circle filled with geometric pattern, and D-shaped terminals that also carry ornamental detail. Running along both sides of the cross, barely legible now, are two inscriptions in early Irish. One of them is a prayer; the other has surrendered most of its letters to time.

When Francis Joseph Bigger visited and recorded the slab in 1900, the inscriptions were already fading, but enough remained to describe the piece as bearing a Celtic interlaced cross with traces of Irish text. By 1913, Henry S. Crawford was able to read one inscription in half-uncial script, a rounded, early medieval letterform used in Irish manuscripts and stonework, as "OR DO LAITHB[ER]TACH", meaning "A Prayer For Laithb[er]tach". The second inscription, running parallel on the other side of the cross, has been reduced to a partial sequence, "B, ?, A, C, H", with the second character too worn to recover. The slab itself is irregularly shaped, measuring 0.69 metres high, 0.55 metres wide, and 0.15 metres thick. It is one of four cross-slabs from Inchcleraun that have since been removed from the island and placed in the care of the Office of Public Works, now held at their depot in Athenry, County Galway.

The transfer off the island means the slab is no longer where Bigger saw it, beside the ruin of The Women's Church, in the open air of Lough Ree. The name Laithb[er]tach, preserved in that worn petition for prayer, belongs to someone otherwise unrecorded here; the stone was their monument, and the inscription its only surviving trace of who they were.