How to get a diamond ring? I bought a diamond ring at Klai Emperor now the ring becomes yellow. What should I do?

I went to cleaning every month, but I still became yellow. Last time I went to his shop and spent 50 yuan polishing. I bought it there. Essence Angry. Essence It didn't take long to wear it again. Essence Essence Essence How to maintain how to clean it yourself. Essence Essence beg. Essence Essence