Dublin Knot Brooch
This is based on designs found on a slab of masonry found among the ruins of the Church of the Temple of Jesus, Co Dublin, of the 10th century CE. It is a beautiful piece of Irish Knot work, the bevelled edges of the four major knots lifts the design and creates flashes of light.
It is 3.5cm in diameter, also available as a necklace (pictured).