Asking that question is almost as broad as what does a person look like.
It depends upon:
geometry (how big the ring is, how thick, is it bent?)
Symmetry (is it a simple band? Is it ornate? Does it have stones? What is the orientation in the ground)
Composition (Is it 10k, 14k, 18k, 22k, 24k, what base metals were used in the alloy)
I found a small, thin, simple, 14k band that rang up as -4
I found a large-ish, simple, 10KP band that rang up between 44-48
I found a 10k white gold ring that rang up between 17-21
I found a 10k gold ring that rang up ~26
Thicker rings will ring up higher than thinner rings.
Purer gold will ring up higher than lower quality gold if they share the same dimensions.
It is a much more complicated question to answer than it seems.