First of all, Ali Auction is the world's largest online auction market and a formal auction platform in line with national laws. All the auction items have to go through strict examination before they can be put on the shelves, so the authenticity is high.

Secondly, the authenticity of jewelry can be judged by the following methods:

1. Check the appearance characteristics of jewelry, such as color, luster, texture, etc.

2. Try to use some simple detection tools, such as magnifying glass or gem appraiser.

3. Refer to the appraisal report of professional jewelry appraisal institutions.

In short, when participating in the judicial auction of Ali assets, it is recommended to choose a merchant with high credibility, and pay attention to the description and appraisal report of the goods to ensure that the jewelry purchased is genuine.