I have my sweet alhambra onyx earrings for about 6 months now and wear them daily except for the shower and swimming. I noticed that the back and clip have turned really dark! As they are 18k yellow gold I was not expecting this. I tried cleaning them but they still look discolored as you can see on the picture.
What should I do? purchased them at a boutique so first owner. Have any of you had this? I have other jewelry from VCA but haven't seen this happening.

What should I do? purchased them at a boutique so first owner. Have any of you had this? I have other jewelry from VCA but haven't seen this happening.
