Gold Corrosion Gold is the most non-reactive of all metals and is benign in all natural and industrial environments. Gold never reacts with oxygen (one of the most active elements), which means it will not rust or tarnish.
Real gold jewellery can eventually tarnish. There are even rare circumstances in which jewellery containing high karats of gold have tarnished but by and large the higher the percentage of gold in the alloy, the less likely that the gold piece will tarnish.
No, gold does not tarnish. It is because acids and other gases have no effect on it. It does not lose its shine. It is a least reactive metal.
Restore your gold and silver jewelry to its full luster and glory and wipe away unsightly tarnish with these quick-and-easy how-to's. But, a few words of caution before you begin any at-home cleaning methods: Double-check the metal content of your jewelry before you begin.
Stubborn tarnish can be removed by the jeweler. Oppositely, costume jewelry and gold-plated jewelry "turns," (as opposed to tarnishing), which in my vocabulary means that the plating has worn off, and no amount of cleaning with Tarnex or anything else is going to make these pieces look new again. Generally speaking, seeing the color green on any of your jewelry isn't a good sign!
Although a gold filled piece of jewelry is not sold gold, it has the same desirable properties and look of solid gold. It won't tarnish and will not rub off or turn colors. Wearers who are sensitive to certain metals can wear gold filled without worries of an allergic reaction.