Silver can get oxidised, and in some cases it will travel through the plating and show as a discolouring of the gold plating. If you see a light discolour, you can use a silver polishing cloth and gently rub on the area until it’s gone.
If your jewelry is showing heavy signs of oxidisation, we recommend that you dip a polishing cloth into some silver cleaning solution and rub on the areas affected. Do not dip the jewelry into the silver clean solution, as it can damage elements like, pearls, rubber, stones etc.
After the cleaning rinse the jewelry in water to remove any leftover chemicals.