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Depends on the design and how much it is being resized, and if reducing or increasing. For a simple one-size change larger, with a simple circular ring, can be as cheap as $20-30 to heat and stretch it.
If needs to be enlarged more or reduced, then it has to be cut and changed to the size wanted, and fused back together, with new gold or silver if enlarging. Obviously, reducing is cheaper than enlarging as no signficant new metal is needed, and silver is cheaper than gold or platinum because of the six-seven fold difference in the cost of the metals.
Resizing involving cutting probably in the $50-100 range for silver or for reducing a gold ring, enlarging a gold ring with added metal could run $100-250 depending on how large the ring is - a real hefty men's ring will obviously take more metal, so more cost, than a thin wedding band.
You want to consider the value of the ring - a real valuable or antique ring you want to take to a true artisan jeweler who makes and modifies rings in-house - a simple economy ring or simple band you would get a cheaper price probably at a chain store like Zales.
When you drop it off be sure to get a written receipt for it while they work on it (usually unless a simple one-size stretch job, cannot do while you wait), and I would also take a picture or two of it on your cell phone, including a zoom shot of any interior engraving, so if there is any question about whether you got back what you dropped off, you have some proof. Of course, the integrity of the shop is critical.
Answered 2 years ago