We always have our finest material crafted and best color quality.  Stainless steel in silver color always keeps the color and it is waterproof and you can take shower and washable.  Gold-plated & stainless steel is plated with 18karat gold many layers, have guaranteed for at least one year. If it is being washed everyday, after +- 8 months, the color will be slowly turned into silverish-goldish.  It is preferable to not wash it everyday or in contact with soap, because it will have the risk as mentioned above. As for 925 silver, the color is not changing at all. :)