Pure silver is not susceptible to tarnishing. In a pure oxygen environment, the same doesn\'t tarnish. Similarly, 925 sterling silver may react in certain cases with ozone or hydrogen sulfide and may tarnish. When used appropriately, the same doesn\'t tarnish at all.
However, the low-grade silver jewelry may not withstand the effect of perfumes, chemicals, etc. These cheap products can tarnish in 2 months themselves. It is thus a good idea to opt for only high-grade silver jewelry to attain the best results.