FAQ: Is the jewelry waterproof?
Generally, contact with water is fine. However, always dry it well after it has been in contact with water. However, avoid swimming or going to the sauna with your golds in chlorine and salt water. I recommend you take it off before showering/bathing, as soap and shampoos can attack the gold surface. The same goes with sports activities that make you sweat, as gold is sensitive to salty skin.
You can find more tips here.