The sarbloh kara symbolizes us because we are not pure and un-reactive to the world around us, like gold.
We should be like iron, everyday when we become dirty we must cleanse ourselves with naam as we cleanse the kara of rust.
GURU GOBIND SINGH JI MAHRAJ HAVING KNOWLEDGE OF THIS HISTORY OF GOLD JEWELERY REJECTED GOLD AND DECIDED TO GIVE HIS KHALSA SARABLOH
Gold is less likely to react with the human body, while some might think this is good it actaully isn’t.
Iron is more reactive than gold, but this is a good thing for our body, because our skin absorbs the iron from a steel or pure iron kara, giving us its strength physicially, but not only that it has great spiritual power to. gold is good for buildings as it isnt very reactive, which is good for protection of buildings. But we humans would not gain any strength from Gold. Our own blood as iron in it.
Without iron we become weak and energyless. Iron is best for putting on our bodies. Iron attracts alot of oxygen, hence why it is in our blood. The Guru gave us these tools for a reason.