The best way to protect the plating of your jewelry is by removing it before washing your hands, showering, exercising (including swimming), and before applying any kind of lotions soaps or oils to your body.
Contact with lotions, soaps, beauty products, cleaning chemicals, etc. can reduce jewelry's shine over time.
Avoid extreme heat. And store jewelry in a cool, dry place.
Stones are fragile and can break, crack, or scratch if not handled with care.
Polish with an eye-glass polishing cloth rubbing in one direction. Do not use tissues, toilet paper, or paper towels.
To prevent loosing earrings, always wear the safety backs when wearing them.