The best way to ensure your jewelry stays true to the patina it came with is to wear it! Over time it will deepen, meaning the shine will take on a lovely glow, and if there is a darkened patina on your piece, it will retain that color and become even better. If your piece has a stone set in it that is not a diamond, I would recommend not swimming, or bathing with it on...with that said, I definitely have broken this rule and everything has been fine. To keep your jewelry looking like it did when it arrived to you, I would keep it stored in a container, like the cloth bag it came in or a jewelry box. If and when you think it needs any cleaning, I recommend not using silver polish or a polishing cloth, this usually ends up taking off too much of the patina. I recommend using a Q-tip with the tiny amount of toothpaste, rub it sparingly all over the surface of the silver and then rinse with water and dry thoroughly. A little drop of dish soap and a toothbrush is also a great way to clean your jewelry.