Celtic/Claddagh Cross. Carved in beech. can be carved in oak,ash, or mahogany ,Original Celtic Crosses were not carved out of the rock – they were inscribed on the rock, such as the cross marker near Gallerus Oratory in Ireland. It is a slab of stone, erected and carved with a Celtic Cross on the surface. The Killaghtee Cross in Dunkineely, Ireland is another fine example, dating from around 650AD. It is thought this latter example marks the transition from flat grave slabs to the upright Celtic crosses. The top of the carving is a Maltese cross with the triple knot of St. Brigit underneath, representing the Holy Trinity.