To ensure the longevity of your handmade piece, avoid wet and strenuous activity while wearing jewelry and remove for swimming, showering, applying lotion, playing sports, hand washing, etc.
Sterling silver, brass and copper tarnish with exposure to oxygen and moisture, so store in a dry location, preferably in an airtight bag. To remove tarnish, simply use a polishing cloth (I recommend the Sunshine brand). Avoid commercial jewelry cleaning solutions as these can be too harsh and can remove patinas or destroy more porous stones like turquoise, opal, malachite, and coral. Avoid contact with stones when using a polishing cloth.
If a piece gets dirty, clean with a soft toothbrush and warm soapy water.