Developed by Chopard and its partner Voestalpine Böhler, Lucent Steel A223 is a metal like no other. REACH-certified and produced with an ethical approach, this unique and precious metal is the product of four years of tireless research.. Special care was taken in order to ensure that the material used to craft the Alpine Eagle was not only beautiful but extremely high-performance. Uniquely durable, Chopard Lucent Steel A223 is 50% harder than other steels. It is also antiallergenic, making it comparable in quality to surgical steel. But all this function would be nothing without form. Chopard Lucent Steel A223 is perhaps most prized for its signature lucent quality that gives the metal an ethereal incandescence.