If you buy a ring from Kay Jewelers that needs to be resized, the cost is $15.99 for silver or gold and $19.99 for platinum. This cost is avoided when an extended warranty is purchased.
Jewelers who offer ring resizing on jewelry that was not purchased from their store charge anywhere from $50 to $500. The cost is determined by the metal used, the width of the band and how much resizing is needed. The cost of making a ring smaller is at the lower end of the price range, and this price typically does not vary based on the amount of resizing needed.