“Can you just size it?” is one of the most common questions we get at the bench, and the honest answer is that sizing a ring up and sizing it down are two different mechanical jobs with different limits. A ring that needs to go down a half size is a ten-minute fix. A ring that needs to go up three sizes—especially in a channel-set diamond band—is a conversation. Here is what actually happens at the bench, and where the line is.
Sizing down: the simpler job
When a ring needs to be smaller, the jeweler cuts a small wedge out of the bottom of the band—away from any stones—and solders the two cut ends together. The solder joint is then filed, shaped, and polished so that it matches the curve of the rest of the band. For a plain wedding band, this is fast, clean, and invisible when done well. Most plain bands can be sized down two or three full sizes without anyone being able to tell.
The complication is stones. If the ring has diamonds or colored gems set around the shank, cutting the band risks disturbing settings that sit close to the cut point. For a full eternity band with stones running all the way around, sizing down is often not possible without removing and resetting half the stones—a job that can cost more than the ring did originally. If you are buying an eternity band, size it right the first time; our at-home sizing guide is the place to start.
Sizing up: where the limits show
Sizing up is harder. The basic method is to cut the band and insert a small bridge of matching metal between the two ends, then solder, file, and polish. The new metal has to match the karat and color of the existing band—14k yellow gold does not accept a 10k solder invisibly, and platinum needs its own soldering protocol. We match the alloy as closely as we can so the repaired area wears at the same rate as the rest of the band.
The other way to size up is to stretch the band on a mandrel. Stretching works for thin, plain bands and adds roughly a half size at most. Beyond that, the metal work-hardens and cracks, and the band thins out where it was stretched. We stretch only when the new size is within a half size and the band has no stones in the shank. Otherwise, we add metal.
How far is too far
As a rule of thumb, plain bands can move up or down by two to three sizes without structural concern. Beyond three sizes, the band’s curvature changes so much that the solder joint sits in a high-stress area, and the ring will not sit true on the finger. At that point, we often recommend rebuilding the shank rather than stretching the original one—effectively keeping the top of the ring but replacing the band underneath.
Stones, engravings, and decorative patterns all add constraints. A band with an engraved pattern around the outside will lose that pattern at the resize point. A ring with a hammered or brushed finish will need the finished area reworked to match. We walk through all of this before we cut anything, because the customer deserves to know what will look different when the piece comes back.
The honest version
Most resizing jobs are straightforward and invisible. The ones that go wrong are the ones that should not have been done at all—an antique ring with structural cracks, a fully stone-set eternity band, a ring whose owner needed to go up four sizes because it was sized wrong at purchase. If a resizing quote comes back surprisingly high, ask why. The answer is usually that the jeweler is protecting a structure that a cheaper, faster fix would have damaged. We cover more of these edge cases in our repair guide.
When in doubt, bring the ring in before you buy another one. We would rather tell you “this can be sized up a half size easily” than have you order a second band to compensate for a fit problem we could have solved in ten minutes.
What to bring when you come in
Bring the ring itself, of course, but also bring any rings that already fit you on the correct finger. Finger size varies between hands and between fingers, and comparing your ring against a well-fitting band gives us a much better read than measuring over the phone. If you are between sizes because your fingers swell in the evening or in summer, tell us that, too—we would rather size you for the average than for the moment you walk in, because a ring that fits perfectly at 9 a.m. is often too tight by dinner.
The definition of carat weight and how it is measured are set out in the Wikipedia entry on carat weight.
Frequently Asked Questions
What ring sizes can you supply in bulk?
US sizes 5–12 including half sizes. Send a size breakdown with your order and we cast to that curve; comfort-fit inner bands reduce resize requests.
Can I order a mixed size run instead of one size?
Yes. Mixed runs are standard for wholesale: specify quantity per size and we pack and label by size at no extra labor cost.
What is the MOQ for custom ring designs?
50 pieces per design for existing molds; 100–300 pieces when a new mold or CAD model is required.
How should I price rings for retail margin?
Most partners use a 3–4x markup on FOB cost for sterling and 2.5–3x for moissanite solos, which keeps landed cost under 30% of retail.
