It is normal for silver jewellery to tarnish over time as it reacts with sulphur in the air. Many chemicals such as perfume and hairspray, cleaning products, chlorine etc. may cause the jewellery to tarnish more quickly or discolour it so try and avoid getting it in contact with chemicals, and it is recommended that you remove your jewellery whilst bathing, exercising or sleeping.
Light tarnish is easily removed by using warm soapy water and brushing gently with a soft old toothbrush. Rinse in cool water and dry carefully with a soft cloth (only use very soft cloths as rough ones may scratch your jewellery). Alternatively, use a silver cloth (a soft cloth impregnated with silver dip) to finish cleaning and polishing your jewellery if necessary; remember to keep the silver cloth free from dirt and grit that may scratch the jewellery.
Oxidised silver has been treated with chemicals to create a permanent dark grey or black patina on the surface. Do not use silver dips or tarnish removers on oxidised silver as it may remove the patina. Completely oxidised (black) jewellery should not need cleaning, though if necessary use soapy water to remove any dirt. Oxidised jewellery with a light grey finish can be cleaned gently with a silver cloth and for mixed silver/black oxidised jewellery use a silver cloth on the silver parts.
Care should be taken to store your jewellery separately from other items of jewellery as any direct contact may scratch the surfaces. It is recommended that the jewellery is stored in the box / bag it was supplied in.