Tarnish does occur because surface molecules of the die casting design silver respond with sulphur from the air, or certain foods such as for example eggs, to make a called silver sulphide. So when...
Therefore an improved idea would be to eliminate the tarnish by converting the silver sulphide back in silver. That is rather easy to do and does not need any sophisticated equipment. You'll just need a bowl large enough to allow the gold object to be completely immersed, some aluminum foil, some heated water and some baking soda.
Line the bottom of the dish with aluminium foil and clicky put in the silver item, making certain it's connected with the foil. Boil enough water to throw that and put it over. Sprinkle the baking soda into the water, using about 1 tablespoon for each pint of water. It'll froth and foam and may possibly spill over the top of the pan, so best do that in the sink. Straightaway, you need to see the tarnish begin to disappear. For gently damaged objects, it should all be gone in a few momemts. For greatly damaged products, you will need to re-heat the water when it has started initially to cool and repeat the treatment.
So how does it work?
Well, it is an electrochemical reaction. In the die casting design hot water and baking soft drink solution a little electric energy is made between the touching aluminum and gold. Since aluminium has a better affinity with sulphur than silver has the electric current causes a chemical reaction between the aluminium and the sulphur. The sulphur in the tarnish is attracted into the solution and towards the aluminium, leaving the silver behind, where it belongs. The response happens faster when the solution is hot. The compound formed when aluminium and sulphur react is called aluminium sulphide and that is what you'll find floating in the base of the pan or stuck to the foil when you are finished. And your gold is likely to be bright and shiny.