Founded by Joseph Warner in 1953, the Warner company produced costume jewelry under his direction until 1971. Usually executed in gold-tone or japanned metal, and often embellished with polychromatic crystal rhinestones, its pieces are mostly of floral or insect design, although novelty subjects, notably umbrella pins, were also produced. The most sought-after, however, are the intricately crafted open-and-shut mechanicals. Comparatively rare, they have been steadily increasing.