I think you're talking about het pied 'markers' not ringers. The markers are solid black lines along the edges of the belly near the tail. I have had 100% het pieds without these markers, but often times if they do have the markers they end up het for pied (but again not in every case). I think for the most part it is consensus that the 'markers' aren't a great indicator and when it comes to het pied you need to trust your breeder.
Here is a 100% het pied I had a while back with the most complete set of het pied markers I've ever seen to give you an idea of what I mean by black lines along the belly. In this case they ran the whole length of body almost although usually the markers are just the last 1/4 of the body.
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