925 Sterling Silver
Real 925 sterling silver jewelry typically has certain marks on it to indicate its purity. These marks include "925", ".925" or "S925", to represent the 92.5 percent pure silver that exists. If these marks are not present, it doesn't necessarily mean that it's not sterling silver.

How to protect the 925 Sterling Silver
1*Put it in an air-tight bag if you not expect to wear for a long time.
2*Usually silver-dip will do a little harm to your jewelry, you could use the silver polishing cloth to wipe the smooth surface of silver jewelry.
3*The sterling silver jewelry should be stored separately to prevent the pieces from rubbing against each other, and cause tiny scratches.
4*Silver Polishing cloths are an excellent choice for cleaning your sterling silver jewelry. They will remove the tarnish and dullness, keeping your sterling gift like new.
5*Don't wear it when you take a bath, swim or do housework.