Unlike Sarabloh (iron), gold is not a strong metal. Gold is a malleable metal, which makes it unfit to serve the multiple purposes of a Kara. A Kara is a strong defensive and protective Shastar (handheld weapon). It can be seen as a spiritual handcuff on our wrist as a reminder to do the right thing. If wearing a Sarbloh Kara gives your arm a medical reaction, you should wear steel, not gold.