Custom made rings are only available if it is a design we stock and will stock in the future, so sale rings are generally not available.
However, are more modern choices.
They may know her ring size or be able to help you estimate.
This includes rings designed with gemstones all the way around like eternity bands.
They will take your finger and put it in several different sized metal rings.
If the circle sits just inside the circumference of your ring, that could still be your size.