18K Solid Gold
18K Gold Plated
in the shower will not harm the solid gold jewelry piece itself, however it can reduce the shine therefore it is not recommended.
To keep its shine, clean the jewelry regularly with a solution of 10-parts warm water and 2-parts dish soap. Polish with a soft cloth.
Store separately from other jewelry, in a soft cloth or plastic bag, remove the excess air by squeezing it, and seal it.