According to Jim (2001)

S8E10 The Meaningful Gift

In a bid to wow Mandy on her birthday, Andy seeks guidance from Jim. Jim suggests steering clear of extravagant jewelry, recommending a heartfelt present instead to truly capture her affection. However, Andy misjudges what holds significance for Mandy, leading to a misunderstanding. Instead of appreciating his thoughtful gesture, Mandy suspects that Andy might be unfaithful, creating tension between them.