Do the gold bar method and get the AutoJewelry bot or whatever and make gold bracelets. I made a profit buying gold ores, smelting them, and then crafting them into bracelets.
Smithing gold bars is worth it, iron would take too long. It's better to make a decent amount of money doing something else, rather than slaving away doing iron bars for cheaper smithing.
Gold bars 100%. Then you can use the time you saved from not doing iron to make some cash. Iron takes sooo much longer. Just think off all the ash you could make in that time if you did gold.