The specific digit designated for a promise ring is not governed by strict convention. This distinguishes it from engagement or wedding rings, which have more established traditions. The choice often reflects personal preference and the intended message behind the symbol.
Wearing a promise ring offers a visual representation of commitment. The placement can emphasize the nature of the commitment: a ring worn on the ring finger might suggest a romantic intention, while wearing it on another finger can signal a promise of friendship or self-love. Historically, such rings have served as pledges of various types, from romantic fidelity to familial bonds, thus evolving beyond a single, prescribed location.