Dupin Diamond Signet RingState Property Dupin signet ring. The boss of the Dupin family, The Dupin Signet Ring effortlessly commands attention. Studded with diamonds from every angle, this contemporary take on a signet ring complements not only your finger, but your unflappable sense of self. Dupin is named after Le Chevalier C. Auguste Dupin, a fictional character created by Edgar Allan Poe, in some of the first ever made detective fiction stories. He is not a professional