ALL JEWELRY (except amulet bracelets which do not contain metal) should be taken off before showering/swimming/exercising, and kept clean & dry in a closed storage when not in use. Jewelry should be properly cleaned once in awhile in order for it to last longer.
BRASS naturally oxidizes depending on the air & body chemistry but brightens up quickly if you polishing with a soft nail buffer. It is not irreversibly tarnished, just temporarily oxidized.
GOLD FILLED to clean use only a soft cloth or jewelry cleaner. Be careful not to tangle chain, gold filled components can last years of regular wear.
Please treat your pieces gently! Although every care is taken to ensure the strongest materials are used (i.e. glue) they may not withstand hard labor!