When talking six figures, the "Pawn Stars" cast always wants to get a second opinion, and they have their trusty experts to lend a hand. For this piece, Rick Harrison calls in Jonathan Ullman, who at the time was the executive director of The Mob Museum of Las Vegas. He displays definite interest in the item, but the seller can't prove that it belonged to Luciano. It's clear he doesn't want to incriminate anyone in possession of the ring, and when talking about how his mother came by it, all he'll say is that she provided services to the Mafia.
Everything could be on the up-and-up (relatively speaking), but without any concrete evidence, there's no way for Ullman to say that the ring 100% belonged to Luciano at one point. The "Pawn Stars" crew isn't in the business to make haphazard purchases, so they ultimately pass on buying the item.
The guys have proven they don't mind buying items related to crimes, but sellers need the paperwork above all else. On a separate episode, a man walks in with a piece of a bill that was part of D.B. Cooper's haul in 1971. Even though it's just a fragment of a bill, Rick doesn't mind paying as much as $1,600 to get his hands on it. We suppose it makes sense the Mafia wouldn't be as litigious when it comes to tracking the history of their regalia.