All gilded sherds are crafted by crafting a normal sherd with a gold nugget in a crafting table. The recipe is shapeless so the positions do not matter.
A preview of the gilded sherds displayed in the world.
A preview of the gilded sherds displayed as an overlayable image.
If you don't care about historic artifacts you can use a blast furnace to reclaim the gold! The high temperatures of the blast furnace will incinerate the sherd leaving only the gold behind.
Sometimes you may regret gilding a sherd and wish to undo the process. This can be done by smelting the sherd in a normal furnace. The gold nugget will be lost but you will get the original sherd back. Do not use a blast furnace!