Made within a few decades of 700 AD,[3] the Hunterston Brooch is cast in silver, gilt, and set with pieces of amber (most now missing), and decorated with interlaced animal bodies in gold filigree.
[3] The diameter of the ring is 12.2 cm, and in its centre there is a cross and a golden glory representing the risen Christ, surrounded by tiny bird heads.
[4] On the other hand, its style is closely comparable to a terminal fragment of a penannular brooch found in Dunbeath in 1860 which probably was made in Scotland; craftsmen may have travelled across the area using the locally popular forms.
[9] Lloyd and Jennifer Laing feel it was probably made in Dalriada, and the Museum of Scotland say "The style of the brooch has Irish parallels, while the filigree resembles metalwork from England.
The brooch was probably made in western Scotland where the two traditions were joined, or perhaps in Ireland by a craftsman trained in foreign techniques.