The Barbican is a Byzantine chain — four rings folded into one another over and over, so the links lace together into a dense, squared rope with a deep texture that breaks the light into dozens of points along its length. It is a substantial chain at 7.9mm across, square in section, so it sits proud of the skin rather than lying flat, and it moves with real weight. Finished with a lobster clasp and offered in ten lengths, from a close 18 inches through to a full 36. Made to order, with the metal and the length specified to your preference.