Any color of karat gold - yellow, pink, and especially white gold - can be damaged by chlorine which is a commonly used disinfectant in swimming pools, jacuzzis, and resort spas.
Research studies have shown that even minuscule amounts of diluted chlorine can be detrimental to all karat metals and should be avoided. Chlorine can be especially damaging to white gold since it can erode the nickel alloy in it and possible cause damaged prongs and weakened settings.
Remember, too, that chlorine is present in many common household products such as bleach, detergent, and cleansers. Evaporation can increase the level of chlorine and other chemicals in these products leaving concentrated deposits which could damage your gold jewelry.
So, before you go for a cool swim this summer, be sure to remove your gold rings, bracelets, earrings, and necklaces. And when doing housework, also take off your gold jewelry or wear rubber gloves.