Edward Masen's Signet Ring, was a family heirloom owned by the Masen family. It is a silver ring, engraved with the letter M, featuring an art-deco design around the band. The signet ring was passed down from Edward Masen, Sr. to his son Edward Masen, Jr. after his death.
Edward, Jr. was wearing the ring when he was in the hospital dying of Spanish Influenza and turned into a vampire by Carlisle Cullen in 1918.