In principle, Zhou Shengsheng only cleans, maintains and repairs its own brand of goods, and doesn't care about other brands of goods.

However, if you meet a kind clerk, it is ok to clean it and check whether the ring holder is loose, and there will be no charge. Polishing is impossible.

Brand stores basically only maintain their own goods, and products outside the brand will not be responsible.

If you are in Beijing, you can go to Caibai, where there is jewelry processing, which can solve your problem, with reasonable price and high credibility.