Sterling silver will tarnish naturally over time but can be cleaned very easily. Be sure to clean the silver only and avoid contact with any stones, particularly pearls and soft stones such as opals and emeralds, as the polish may cause damage to these stones.
Be particularly careful of chlorine. Chlorine, especially at high temperatures, can permanently damage or discolor your silver jewelry. Avoid wearing silver jewelry while using chlorine bleach or while in a pool or hot tub. Tarnish is also accelerated in a humid environment. Oily salts from fingers can also tarnish silver.
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