Silver 925 means that they have a minimum content of 92.5 pure silver.ur. Silver jewelry is waterproof. On the other hand, you should avoid wearing them in the swimming pool, because contact with chlorine will accelerate oxidation and cleaning will be recommended: rub a mixture of baking soda and water with a toothbrush. dents). Care: Wear them regularly and store them in your Jen Findings Pouch. When the jewels tarnish, just rub them with a cloth and they will regain their shine!