A fine-link chain designed to secure optical devices — monocles, loupes, scan lenses — around the neck when not in active use. The chain features a magnetic quick-release clasp and is available in steel, black oxide, or gold-tone. A small retractable tether prevents the optical device from swinging during movement.

A minor accessory that has become a significant social signal in Spire circles — wearing an eyepiece chain implies you own precision optics worth securing, which implies wealth and profession. Empty chains worn as pure fashion statements have become their own trend.