While 925 sterling silver is not completely impervious to water, it can generally withstand exposure to water and moisture without significant damage. However, prolonged or frequent exposure to water can contribute to the tarnishing of sterling silver.

Tarnish is a natural reaction that occurs when silver comes into contact with sulfur-containing substances in the air, water, or certain chemicals. Water, especially if it contains sulfur or other impurities, can accelerate the tarnishing process. Tarnish appears as a dark discoloration on the surface of the silver but does not affect the integrity of the metal.

To minimize the risk of tarnish and keep your 925 sterling silver items looking their best:

  1. Dry Thoroughly: After exposure to water, make sure to dry your sterling silver thoroughly with a soft cloth. Moisture left on the metal can contribute to tarnish.

  2. Avoid Prolonged Exposure: While wearing your sterling silver jewelry in water occasionally (e.g., washing hands) is generally fine, it's advisable to avoid prolonged exposure to water, especially in environments where the water may contain impurities.

  3. Storage: When not in use, store your sterling silver items in a cool, dry place. Using airtight containers or bags with anti-tarnish strips can help protect the silver from exposure to air and moisture.

  4. Avoid Harsh Chemicals: Avoid exposing your sterling silver to harsh chemicals, such as chlorine from swimming pools or household cleaning products, as these can accelerate tarnishing.

In summary, 925 sterling silver is not completely waterproof, but with proper care and maintenance, you can help preserve its appearance and minimize the effects of tarnish caused by exposure to water.