Silver
Silver is a beautiful lustrous metal, used in making much of contemporary jewellery. It does unfortunately have one downside, and that is tarnish. The modern world and the way we live means there is a lot of sulphur in the atmosphere, this is what causes tarnish. Centuries ago silver kept its polish far longer as there was very little pollution.
Regular cleaning and polishing will restore the original look of silver, but take care not to polish too enthusiastically, as silver is actually removed from the surface. Consult your jeweller for advice on which product to use, and how to use it.
There is available a modern polishing foam that cleans silver without polishing, it even contains a tarnish resistant formula.