It is a small rough stone, measuring just 35 centimetres long and 28 centimetres wide, preserving only part of a rounded head and a single arm of what was once a cross. That notch at the junction where the head meets the arm is the detail that holds the eye once you know to look for it, a deliberate cut in the stone that defined the shape of the cross against its surrounding field.

The fragment belongs to a tradition of incised and carved stone crosses that appear throughout early medieval Irish monastic sites, where crosses served not only as devotional objects but as boundary markers, grave indicators, and focal points for prayer. Skellig Michael, a monastery perched on a rock eight miles off the Kerry coast, was occupied by monks from roughly the sixth or seventh century, and small carved stones of this kind were among the simplest and most durable expressions of that community's religious life. This particular piece is now loose, lying on a wall rather than standing in any original position, which means its precise function within the monastery is no longer recoverable. Its modest scale suggests it was never a monumental piece, more likely a personal or local devotional object than a landmark cross.