Carndonagh's diamond area has change recently and has got great praise from design experts on the new layout. In the center of the diamond is a image of the Donagh cross. Many new trees and shrubs have been planted, along with additional seating for shoppers and visitors.

The cross is believed by some authorities to date from the last quarter of the seventh century and is one of the oldest in Europe. Each pillar stone has a carving on each side, though some, presumably, are unfinished, David as a warrior is outlined in pocking, and another shows only a head, also in pocking, with the rest of the surface blank. The carving of the figure seated playing a harp-like instrument shows how the artist cleverly fitted the profile of the face, and indeed the whole figure, to the shape of the stone.