Carved into its upper surface is a roughly circular bowl, about 35 centimetres across and 22 centimetres deep. This is a bullaun stone, a type of ancient carved rock found across Ireland, typically distinguished by one or more deliberately ground hollows whose original purpose remains a matter of debate among scholars. Theories range from liturgical use to grain-grinding, though many bullaun stones are found in close association with early ecclesiastical sites, suggesting a ritual or votive function. What makes this particular spot quietly remarkable is not one such stone but three, clustered within a small radius on the lower southern slope of Kilmacoliver Hill, looking out over the valley of the River Suir.

The two stones within the graveyard, lying side by side near the wall, were not always visible. They came to light only in 1985, during a clean-up of Kilkieran graveyard, having apparently been buried or obscured before that point. Their rediscovery is noted by Hurley (1988). A third bullaun stone stands beside a holy well approximately 25 metres east of the graveyard's southern side, reinforcing the sense that this hillside carried some sustained significance in early Christian or perhaps pre-Christian practice. The boulder containing the bowl described in the records is a free-standing sandstone block, roughly one metre by 77 centimetres, with a depth that tapers from about 48 centimetres at its thickest to 34 centimetres at its thinnest.