Berlin Iron EarringGeorgian era Berlin iron earrings. In a rare elongated trefoil drop form. The popularity of iron and steel jewelry is considered a result of wartime political and social climates. Although its unique style had an enduring appeal and was worn as mourning jewelry well into the 19th century. Cast Iron jewelry was developed in Germany in 1806 it became the symbol of Prussian patriotism and resistance to Napoleon I in the Prussian War of Liberation fought