925 Silver jewellery tarnishes when exposed to salty air, chlorine, humidity, body sweat, cosmetics, fragrances, household bleach and other strong chemicals. To prevent tarnish as much as possible, we suggest that you store your fine jewelry in a safe, dry place.? For tarnished jewellery, rub gently with an adequate silver cloth until any oxidization is cleaned.? You may also opt for a Silver Dip where you immerse tarnished jewellery in the cleaning solution, and swirl for 5-10 seconds. Afterwards rinse with warm water and dry thoroughly with a soft cloth or with the use of an air compressor.