The caduceus was the magic staff of Hermes (Mercury), the god of commerce, eloquence, invention, travel and theft, and so was a symbol of heralds and commerce, not medicine. The words caduity & caducous imply temporality, perishableness and senility, while the medical profession espouses renewal, vitality and health. This is a well executed enamelled stickpin set with small diamonds and two natural pearls, made circa 1890.