Diamonds

O. Henry uses Bob's diamond jewelry to signify the kind of material success that Bob's life of crime out west has provided him. The narrator mentions in detail both Bob's diamond scarf-pin that catches Patrolman Wells's attention, as well as the diamond-studded watch that Bob uses to double-check the time. Because Bob has illegally acquired his riches, he does not deserve them, and O. Henry emphasizes this fact.

Though Bob attempts to pass himself off as a gentleman of means, it is clear to Wells that the air of prosperity does not truly suit Bob. Bob's character assumes that because he has the diamonds, then the police would leave him alone out of respect for his status. Yet, in this story, the gems are a key giveaway to “Silky” Bob's criminal identity and further proof that he is not as clever as he thinks he is...