Your bracelet will have minimal stretching if you are gentle putting it on and taking it off. Never yank or pull it away from the hand while removing. Instead, roll off your wrist one at a time.
Sterling Silver will tarnish naturally with the acids in your skin, wearing them in chlorinated water will expedite the oxidation. The Yellow Gold and Rose Gold will not tarnish, but to be safe, we do not recommend wearing them in water.
To clean your silver jewelry, simply use a silver polish and soft cloth.