Which was the most important metal in the age of Guptas?

Iron was the most important metal during the Gupta Age, essential for weapons, agricultural tools, and construction. The period saw significant advances in iron metallurgy, including the famous iron pillar at Mehrauli (Delhi) that has resisted corrosion for over 1,600 years. While gold and silver were used for coinage and ornaments, iron's practical applications made it most crucial.