To prevent jewellery from tarnishing:
Store jewellery carefully in its original packaging or a jewellery box.
Clean jewellery using warm water, mild soap and a soft bristle toothbrush.
Use a non abrasive silver cloth or soft lint free cloth to polish jewellery and remove tarnishing.
Don't expose jewellery to harsh chemicals or perfumes as this could cause damage and discoloration.
Don't wear jewellery when doing housework to avoid unnecessary knocks and scratches.