Discolors! Not recommendable!

I have given me the trailer for Christmas 2014 itself.
I was insanely happy and when he arrived, he saw visually from insanely great! Since then I have worn it maybe 5-8 times. After the 3rd time wearing, I noticed that the trailer is properly yellow ... But really ... Of fine silver nothing more to see ... I am Non smoking, have me otherwise niergendswo exposed to cigarette smoke and no sprayed perfume on it or anything.

Well, I have to clean the trailer then.
Since then, he was in my little box jewelry and I wanted to make it last weekend ran again and lo and behold - again really yellow! I can me absolutely not explain, have no other piece of jewelry such problems. He looks really disgusting and I'm so not hinmachen him. But I can be cleaned every month it bad ...

For the money I expected more clearly. Unfortunately I can not give him back. It's just really, really annoying ...

Because it's optical, when it is not yellow, so beautiful, he gets a star. Otherwise, not recommended.