Ohio State University Big Ten Champions 1991 Season Jim Jackson Ring NCAA
I am not into hoops, but for memorabilia collectors I wanted to note this auction which appears to be buried in the eBay search.
I would not suggest trying to snipe at the very last moment because the seller will likely pull the item if the bids stay this low, but a memorabilia collector might send an eBay nessage to show interest (ask what size it is) then toss a bid in the last 2 days.
I am not familiar enough with BB rings to know what a good price is.
I am not familiar with the seller, but jewelers tend to overvalue sports championship rings until they get stuck with them sitting in their display case for a year. If you suspect authenticity I can get you in contact with a top authenticator.