It does not indicate that it is not of good quality. Putting on some hair spray and perfume BEFORE putting on the jewelry will help. And it must be cleaned after use. Metal: Sterling Silver. Metal Purity.925, Sterling.
The plating also serves a protection to the jewelry from tarnishing. However the coating is sensitive to acid chemical from body secretion such as sweat and, cleaning material, lotion and cream. It does not indicate that it is not of good quality.