Gold and platinum are hardy metals, which should be able to withstand most of the rigours of normal daily use. However even with normal wear they will scratch and dent and with hard wear may misshape. They can be polished with a soft cloth but I don’t recommend a silver polish cloth as they generally contain abrasive powder.
The gold used in jewellery does tarnish over time as it’s exposed to impurities in the air. We call this process oxidation. Pure gold itself doesn’t tarnish, but the alloys mixed in with gold does. Unfortunately pure gold is too soft to be used for jewellery. Fortunately, it’s not a difficult problem to solve. A simple rebuffing of gold jewellery is enough to bring out the shine in the gold. If you would like to renew your jewellery to its original shine and sparkle get in touch to have a professional clean, polish and where necessary rhodium plate. This service can most often be done while you wait.