A promise ring is an excellent gift for someone you know you want to share a permanent bond with, even if you don't quite know what the future holds for you both.Ring Finger of the Right Hand
An alternative is to wear a promise ring on the right hand. This leaves the ring finger of the left hand ready for the exchange of engagement rings. This is a good solution that gets around any concerns about needing to get a ring re sized. This also helps avoid any awkward questions about whether or not the couple is engaged.