My attempt at describing a Jewell....
With a factory trigger you get a serious yank going on, and then all the sudden a bang. Or yank followed by drag, followed by bang.
With a lightened/adjusted but not polished trigger you get less pull and sometimes some funky vibrations coming back during the travel before the bang.
With a tuned/polished factory trigger you usually get a lighter pull, then some small amount of travel felt at a constant pull, although smooth, and then a bang.
With the Jewell you locate the trigger with your fingertip, slowly increase the compression of the meat of your finger, and a bang.
I tried my first Jewell trigger 3 years ago. I have bought three since.
Word of caution: If you start shooting Jewells and then go back to a factory trigger. You end up running out of breath once or twice trying to shoot it, and may even check the safety once or twice before you actually get the first round sent.