What Hand to Wear it on
Most brides prefer the diamond engagement ring on their right hands. It is a good feeling to have on both rings. This spares any worry about the safety of the engagement ring. However, your two hands probably differ by half a size, as most people do, so do some measuring beforehand.
Let the Maid of Honor Look after it
Just the way the best man carries the wedding rings, the maid of honor can be given an engagement ring to hold. If she cannot carry it anywhere on her dress, give it to the best man. Get a jewelry pouch so that it stays safe. Get it back after the ceremony.
Leave it with a Family Member
This lets you include a family member by giving them an important task. Your mother would be the one most touched by such a gesture, which would make her feel truly special. Alternatively, a younger sister can be given the ring.