For precious pearl pieces, it's best to use a delicate cleaner that does not involve soaking the jewellery. They only need cleaning when absolutely necessary. If you're like Emma Stone aboard the pearl engagement ring trend, it's best to take extra care when you can; including not wearing the delicate piece in the shower and taking it off to wash your hands. A no-soak treatment also works well for turquoise and opals (which are also porous stones).
Your diamonds are sparkly and bright - until you wear them daily, that is. Everyday wear of something like an engagement ring can result in a lacklustre brilliance from collecting dirt, grime and even soap residue from hand washing. Your diamond pieces should be taken to the jewellery pros every six months to a year (they use an ultrasonic steamer for a super thorough hose down), but there's a way to maintain its sparkle all on your own: by concocting a mild at-home cleaning solution.
First, create a soapy solution with a couple of drops of dish soap and water, and then add a splash of ammonia (six parts water to one part ammonia works, too). Second, soak your jewellery pieces in the solution for a minute or two. Then, use a soft-bristle toothbrush and gently scrub every nook and cranny. Finally, run the piece under hot water. Rinse well. Voila!
Give your gold pieces a gentle bath in a solution of a few drops of dish soap and a little warm water. After a bit of a soak, lay them on a soft cloth and go over the crevices and chain links with a soft toothbrush to dislodge any dirt trapped there. Rinse everything under running water (for small and delicate pieces, be sure to use a strainer so they don't get lost down the drain). Buff dry with a soft cloth.