Li Jiacun store of Northwest Gold and Jewelry Trading Center should be authentic. The store is approved by the State Administration for Industry and Commerce. Having a certificate of conformity issued by the Administration for Industry and Commerce, which is officially certified and allowed by law. It is very formal.
However, even if you buy in a regular store, you may buy unsatisfactory goods. I suggest you carefully compare different products, prices and quality before buying to ensure that the goods you buy meet your needs and budget.
I wish you happy shopping and happy wedding!