Pearl, opal, emerald, turquoise, amber, coral and onyx are all examples of delicate, soft or porous gemstones. As such, silver or gold jewellery items which carry this type of gemstone should be carefully cleaned with a soft cotton cloth or designated care kit.
Harsh, abrasive cleaners will scratch these precious stones, creating flaws that remove their lustre. In emeralds, where natural flaws are often filled and hidden with oil, harsh cleaning will remove this oil, producing a similar effect on their appearance.
Even soaking in warm water can damage these gemstones, as residues left behind once the water has been absorbed build up leaving them dull and lacking their original shine. For the same reason, care should also be taken to avoid contact with make-up, perfume or hairspray. Where such stones are dampened, they should always be allowed to dry completely before being stored away.