St Davids 11 is a rough, unshaped quadrangular pillar of dolerite, tapering gradually towards the bottom on its broad faces, and towards the top on its narrow faces. It stands within the south-west corner of St Non's Chapel (NPRN 301109), but was first recorded in 1856, built into a drystone wall to the chapel's east side.

Dimensions are given as 115.5cm height x 38 < 59.5cm width x 39.5 > 19cm diameter. The stone is carved on one broad face, with a deeply-incised, linear, Latin ring-cross with a short stem. The carving is thought to be 7th- or 8th-century in date.

Sources include:
Edwards, N. 2007, Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales

N Vousden, 31 October 2018