Ring Resizing: What Can and Cannot Be Resized

A ring is resized at the bottom of the shank, the part under your palm, because that spot is furthest from the stones and the design.

• Sizing down: the jeweler cuts out a small piece of the shank, closes the gap, solders it and polishes the seam away.
• Sizing up by a little: the shank can be stretched on a mandrel about half a size on a plain band. Stretching thins the metal, so it is only for small changes.
• Sizing up by more: the shank is cut and a piece of matching gold is soldered in.

Done well, the seam disappears after polishing. The key is matching the metal: 14K yellow needs 14K yellow solder and insert, or you will see a line years later.

One US ring size is about 0.8 mm in inside diameter, or about 2.5 mm around the finger. A US size 6 is about 16.5 mm across, a size 7 about 17.3 mm.

Ring type	Typical safe range	Why
Plain gold band	Up to about 2 sizes	No stones near the cut
Solitaire (single center stone)	About 1 to 2 sizes	Too much change bends the head and loosens prongs
Half-eternity or side-stone band	About 1 size	Stones near the bottom can loosen
Heavy signet or men's diamond ring	Small changes only	Thick shanks and set tops resist bending
Full eternity band	Usually not resizable	Stones run all the way around

These are common bench limits, not hard rules. A thin band behaves differently from a thick one, and the jeweler doing the work makes the final call after seeing the ring.

If stones run all the way around the ring, there is no plain metal to cut. That is the case for a full eternity band such as the Classic Eternity Band ($4,870) or the Diamond Millenia Eternity Ring ($1,750). Changing the size means rebuilding the band with more or fewer stones, which is basically a new ring.

Other hard cases:

• Channel-set bands. The two walls holding the stones flex when the ring is reshaped and the stones can pop.
• Tension settings. The stone is held by the spring of the metal. Change the shank and you change the grip.
• Patterned or engraved shanks. The pattern breaks at the seam.
• Two-tone or mixed-metal bands. The colors have to line up after the cut.
• Rings in tungsten, titanium or ceramic. These are not resized at all.

Heavy men's signets like the Round Baguette Signet Ring ($8,680) or the Square Baguette Signet Ring ($8,110) have a dense, set top that sits far from the shank, so small changes are possible. Large ones are a job to discuss with a bench jeweler before you commit.

Any change to the shank pulls slightly on the head that holds the center stone. On a single-stone ring the prongs should be checked and retightened after every resize. A pear or marquise is the most exposed because its point sits in a V-prong. On a round lab diamond ring like the Round Lab Diamond Ring 1.5 ct, 14K White Gold ($2,000), look at every prong tip with a loupe after sizing.

Bands with small stones along the sides, like the Mia Bead Set band ($1,330) or the Ava Bezel Set band ($810), can usually go about one size before the stones near the bottom feel the stress. Bezel-set stones are the safest because metal wraps all the way around them.

The cheapest resize is the one you never need. Fingers swell in Miami heat and shrink in cold air conditioning, so measure late in the day and more than once. If you are buying a surprise, borrow a ring she wears on the same finger and trace the inside, or measure it against a chart.

• Use our ring size chart to convert mm to US sizes.
• Follow how to measure ring size at home with string or paper.
• Wide bands, 6 mm and up, usually need about half a size larger than a thin band.

Shopping for an engagement ring? The lab diamond engagement rings in our showroom are solitaire-style settings, and you can try on pear, radiant and emerald cuts in person at our Miami showroom to confirm the size on the spot. Browse all rings to compare styles.

A simple size-down on a plain band is often a same-week bench job at most jewelers. Adding metal, rebuilding a shank or resetting stones takes longer because the jeweler has to match alloy and check every prong. Industry prices vary with metal, width and stones, so get a written quote that names the starting size, the finished size and whether retipping or prong work is included.

Before you hand a ring over, take a clear photo of it, note the stone count, and ask that the jeweler confirm the stones in front of you. That is good practice at any shop.