According to Jim (2001)

S6E14 What Lies Beneath

When Andy uses his new metal detector, he stumbles upon Jim's missing wedding ring, stirring up trouble for Jim. Years earlier, Jim had purchased a counterfeit ring to mask the loss from Cheryl, and now the discovery threatens to unravel his deception. As secrets begin to surface, Jim faces the challenge of managing the fallout from his past mistake while trying to maintain his relationship with Cheryl.