Here's some discussion of color polishing here:
https://forum.purseblog.com/threads/qn-on-jade-bangle.754664/page-716
To me it can look like little weblike tracks of intense color, or it can be seen gathered in any surface imperfections on the jade. Put a strong light source behind the jade (iPhone flashlight works nicely) and view with your loupe. If you see some of those suspicious areas, you can use a q-tip (wetted with alcohol but not much) on those areas, and you may see some color transfer on the q-tip. That bangle is lovely! Based on others I've purchased from them, I would be very surprised if it were color polished.