Franklin finds Jennings to be a very intriguing person, first by his outer appearance.
From this description one learns that he has a dark complexion and he resembles someone of Eastern origin. The use of the phrase "fleshless cheeks" almost assigns a lifeless look to him. His hair, which Betteredge describes as piebald, is a mixture of black and white. His sullen looks are a testament of the past he has endured, especially considering he is only 40 but could be mistaken as being older than Betteredge who is at least seventy. Jennings, whom Franklin describes as inscrutable, begins to tell the story of his family history before abruptly stopping:
Nevertheless, we get a clear picture that he is of mixed origin.
Despite Jennings' appearance and his history of being an outcast, Franklin describes him as a "gentleman." The outer appearance of Jennings has caused other to view him suspiciously, making it nearly impossible for him to maintain a position anywhere in England. Nevertheless, Collins portrays him as a man injustly ostracized from society but who proves to be not only educated and learned, but also valuable in solving the mystery of the diamond. It is through someone of mixed heritage, which along with his piebald hair suggests a coexistence of the races, that the mystery is solved. Jennings' addiction to opium may be an illustration of the struggle between England and its colonies.