St. Justin crafts each piece of jewellery individually by hand in Cornwall, England, home to many native Celts.

It is in places such as Cornwall, Ireland, Wales, and Scotland that the art of the ancient Celts and Britons survives on crosses or stone tombs or through pottery fragments and metal ornaments found in the earth. St. Justin works in the alloy of pewter, 92% tin with copper and antimony added to harden it and enhance it for casting. Their Fusion division handcrafts jewelry in Sterling silver. Using the ancient designs from Celtic art, St. Justin creates timeless brooches, pendants, earrings, and hair accessories.