How to Solder Gold

Put the two items to be soldered together on a soldering block. File the area to be soldered gently with a small file or fine-grade sandpaper. Place the items as closely as possible to where they will be soldered. Secure one of the items with a small, portable vice, if possible.
Heat up the area to be soldered with an acetylene (or propane) torch.
Brush a dab or two of liquid flux into the gap between the two pieces of metal. Flux is a chemical compound that prevents oxidation. Oxides interfere with the bonding action of the metals.
Place the tip of gold solder on top of the flux, and into the joint where the items come together. Push the solder into the gap with a solder pick. Heat the tip of the solder with the torch until the solder flows into the gap. Be careful not to overheat. Remove any excess solder immediately with a sponge.
Dip the area that has been soldered into a pickle solution. A pickle solution is an acid that removes oxide from gold and cleans up any residue left after soldering.
Allow the area to cool completely. Use a file or fine sandpaper to smooth out any rough edges.
Shine the area with a buffing wheel, if possible, or with a polishing cloth.
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