Silver objects oxidize over time, but they can regain their glow quickly, if you use the following secret that I found from my hometown jeweler. He uses this trick for decades, and nobody brag about it!
You only need:
– aluminum foil
– baking soda
– a large pan
Put the aluminium foil over the bottom and the walls of the pan, and fill it with water. When the water in the pan starts to boil, add 2 tablespoons of baking soda. Then insert the silver objects, and leave them for a few minutes until you notice that they have regained their shine, and then remove them from the pan.
Silver jewelries with stones are wrapped in aluminium foil with coarse salt. Put them in the boiling water for 10 minutes, and then remove and rinse them thoroughly with water. If you want to delay their oxidation, cover them with a layer of colorless nail polish.