Generally, a star symbol like ***** will appear in the remarks column on the jade appraisal certificate.
If you are referring to stars like this, however, these stars have no meaning. There is probably nothing to note, and it doesn’t look good if it is empty, so filling in a few stars will make it feel less empty. If there are notes, such as 925 mark, diamond setting untested, etc., they will be written in the notes place, but there will be no such. Stars.