If you are stuck in such a difficult scenario, it is crucial to take note of the fact that a promise ring is significant because of what it means, and not because how it is worn. This means that you can wear diamond promise rings as per your personal preferences.
As you would probably know, a promise ring diamond displays the promise of a commitment between couples to one another. As a result, several couples prefer to wear this ring on their wedding ring finger, that is, on the ring finger of their left hand. If you wish to show others that the relationship between your loved one will eventually lead to marriage, you should consider following that trend.
When planning to purchase an expensive diamond promise ring for your fiancée or loved one, make certain that the preferred ring will fit on her ring finger. If not, it is best to customize the ring size, or look for other alternatives.