A gold bar is a bar of refined gold created through the Smithing skill at level 40 by using a gold ore with a furnace, or by casting Superheat Item on a gold ore. This normally gives 22.5 Smithing experience per bar, but if the goldsmith gauntlets from the Family Crest quest are worn, the experience is boosted to 56.2 per bar.
Gold bars cannot be made into weapons and armour as other bars can. Instead, the primary use of gold bars is to create jewellery with the Crafting skill. To craft gold bars into jewellery, players must use a gold bar on a furnace with the proper mould in their inventory. If players wish to craft jewellery with gems inset, they must also have the respective cut gems in their inventory.
Apart from jewellery, gold bars can be used to create gold helmets, which are used in the Between a Rock… quest to access Dondakan’s mine, and gold bowls which are used in the Legends’ Quest.
You can obtain one gold bar from finishing the Goblin Diplomacy quest.
You can also obtain a gold bar from downstairs in Varrock’s west bank or in the Ogre cave at Corsair Cove south of the bank vault by using the Telekinetic Grab spell. The northernmost section of the cave at Corsair Cove (accessible after Dragon Slayer) also has three gold bars that can be picked up without the need of Telekinetic Grab.