Over time your jewelry will tarnish, so I recommend having a good polishing cloth such as this one to keep it shining!  It is a versatile cloth, impregnated with special chemical cleansing agents and non-scratching micro-abrasives, suitable for your metal jewelry as well as soft gemstones. It can also be used to brighten chrome, wood, ceramic, hard plastic and glass.  Keep your jewelry in an airtight place when you are not wearing it (like a ziploc bag) to considerably slow down the natural tarnishing process.