I have found 3 big gold men's class rings so far.
The first one was found in front of an abandoned grade school about 1/2 mile from where the owner actually lost it when it fell off his finger as he was driving and bounced down an embankment near a bridge.
How it got moved to the place where I found it I have no clue...and that return did not go well.
I hunt grass islands at high school parking lots all the time and find all kinds of silver and gold rings, high school pins and other stuff but never a high school class ring.
The 2 others were found near picnic areas at 2 different parks, so actually they can be anywhere people hang out...you just have to be lucky enough to swing over one.
All 3 were between 13 and 17 grams of 10k gold so they came in as zinc, and a big reason why I dig every zinc signal I come across to this day.