Sterling silver, even real .925 sterling silver, will always tarnish. While pure 99.9% silver does not tarnish, any sterling silver will tarnish over time as a result of the metal mixed in. However, fortunately there are many ways to keep sterling silver from tarnishing.
Does silver tarnish? This is a tricky question, as technically, tarnishing does not occur in pure silver. However, pure silver is too soft to be used in jewelry crafting. Therefore, jewelers will often add a small quantity of copper to strengthen the silver. The resulting product is .925 sterling silver, which contains 92.5% pure silver and 7.5% copper. It is the primary material used for silver jewelry.
Unfortunately, because of the metals added, sterling silver, even real .925 sterling silver, will always tarnish.
Tarnishing thus does not mean that the silver is low purity. Moreover, as sterling silver has higher percentage of silver, it will tarnish much slower than silver of low purity. Therefore, sterling silver is still a wonderful choice of precious metals.
White Zircon Silver Ring 
White Zircon Silver Ring 
White Zircon Silver Ring
SILVER OXIDIZES
Silver becomes black because of hydrogen sulfide (sulfur), a substance that occurs in the air. When silver comes into contact with it, a chemical reaction takes place and a black layer is formed. Silver oxidizes faster in places with a lot of light and high humidity.
Also contact with products like cosmetics, hair spray, perfume, deodorant, body lotion, bleach, etc., can speed up the oxidizing process.
SULPHER COMPOUNDS
Besides, sulpher compounds can also cause Sterling Silver to tarnish. Avoid wearing your jewelry in heavily polluted environments. Also be careful when handling coal or oil, and when preparing foods containing sulphur such as eggs, onions, fish or shellfish.
PH OF SKIN
Another factor to consider is the PH of our skin. The natural oils that your skin produces can also react to your silver jewelry. The extent to which the silver reacts with these substances from your skin is highly dependent on the type of food you eat, alcohol consumption and whether you are taking medication. These things influence the acidity of your skin, which can cause a reaction. Also sweat (which ammonia occurs in) raises the acidity of the skin and could tarnish the silver.
PREVENTION IS BETTER THAN CURE!
Do not store your silver jewelry in damp places such as the bathroom or the kitchen.
Take off your silver jewelry before you have used make-up, perfume, hair spray and other beauty products.
Take off your silver jewelry when you go swimming, cleaning (cleaning products are very bad), hand washing or contact with sea water (salt water).
Keep it clean：After wearing your sterling silver jewelry, clean it with a dry soft cloth, or polishing cloth, before storing it away.
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