The icon for the furnace in RuneScape is a smelter or kiln. It is essentially a dark grey box with a bright orange-red center.
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the only purposes for silver making it into tiaras with tiara molds, selling them or trading them. If you mean turning them into bars then you must put it in a furnace located anywhere in the runescape world and selecting the silver bar icon after the the furnace is selected. I think there are more options for what you can do as a members. -Exerorg
the icon is a flower pot
At a general store. The "Pot" icon on your mini map.
The furnace is pretty much right next to the bank area.
You bring a gold bar and a ring mould to a furnace, use the bar with furnace, and select 'gold ring'.