If you ask the "ring guys" they will tell you it's more to do with location than numbers. The number spread can be HUGE with all the different sizes,configurations and actual content of gold in the item. Generally 18k stuff is up in the zinc penny range while smaller 9k stuff would be hanging out with the foil,and ANYWHERE in between. If I knew the trick to hunting gold do you think we'd all be hunting silver?
Silver is relatively easy to find compared to gold,because there's more of it and coins especially are uniform in size,so it makes an ID much easier. I just posted this over on another forum but I'll do it again.....
In MY experience with my IDX Pro,I've found probably 20 silver rings,2-3 gold rings and numerous kids rings. They ALL had one thing in common,and that is that they were a SHORT SOLID signal. It comes on really quick and goes really quick. Also,the pinpoint was TIGHT. I actually dug one with my Explorer2 and the 5" coil that did the SAME thing,so I don't think it's machine specific. I have NEVER dug a ring that didn't have that trait. I can't say they all will,but all of MINE did. The signal itself is distinct to me,and I use Killer B Hornet phones. Perhaps that is some of the reason,perhaps not,but they MAY accentuate it more. Don't go blowing big money on phones cuz I said to,I'm just relating my experience.
Lastly....location,as stated,is key to finding jewelry in volume. I've never done it but read all about it. You need a busy beach,or at least a beach where people have been. Also volleyball sandpits,around basketball courts,etc. Think about what people are/were doing and you can make some good finds,if someone hasn't beaten you there.
Kevin