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Borrow a ring she already wears on the correct hand and finger, then match its inside edge to a sizing chart or take it to a jeweller. That gives you an exact size without a single question asked. If there is nothing to borrow, a string or paper strip measured while she sleeps, a friend sent in to ask on your behalf, or a careful guess from the average range are the fallbacks, roughly in that order of accuracy.
What's the single best way to find her ring size without asking?
Borrow a ring she already wears regularly, but it has to be the right one: the hand and the finger the new ring is actually meant for, since size is not the same from one finger to the next. Most people buy an eternity-style band or a statement piece like a marquise-cut ring for the left ring finger, so a ring worn there, even a casual one, is the one to use.
From there, two routes turn it into an actual size: lay it over a printed sizing chart and match its inside edge to a circle, or take it to any jewellery counter and have it checked against a mandrel, the tapered metal rod jewellers use to read size directly. Either takes a few minutes, and neither requires her to be in the room.
How do you measure a borrowed ring at home?
A printable sizing chart only works if the page prints at true scale. Most ring-size PDFs include a short reference line for exactly this reason: measure it with a ruler before you trust the chart, because a browser or printer set to "fit to page" will shrink the circles just enough to throw the result off.
Lay the borrowed ring flat and match its inner edge to the closest printed circle, not the outer edge, which is wider and will read a size or more too big. If it falls between two circles, note both. That gap is useful information, not a failed measurement.
What if there's no ring to borrow?
A length of string or a strip of paper, wrapped once around the base of the finger while she is asleep or distracted, is the standard fallback. Mark where the ends meet, measure that length in millimetres, divide by 3.14 to get the diameter, and match that figure to a sizing chart.
It works, but it is less exact than a borrowed ring: string stretches slightly under tension, and a finger measured mid-sleep is not necessarily at its most relaxed. Taking three attempts and keeping the middle result is a reasonable way to average out the noise.
| Method | Accuracy | Risk of being noticed | What it needs |
|---|---|---|---|
| Borrowed ring + printed chart | Good, if printed at true scale | Low — ring is back before it's missed | A ring from the correct hand, a printer |
| Borrowed ring + jeweller's mandrel | Best, effectively exact | Low | Ten minutes at a jewellery counter |
| String or paper strip | Fair — stretch and timing add error | Higher — she has to stay still | String, a ruler, a sound sleeper |
| A friend finds out or arranges a try-on | Depends on the person asked | Low, if they're convincing | Someone she trusts not to spoil the surprise |
| Guess from the average, size up | Rough — a starting point only | None | Nothing, but expect to resize if the style allows it |
Can someone else find out for you?
A friend or relative already in on the plan can ask her directly, or more subtly, arrange for her to try on a ring close to the right size. A newly engaged friend's ring is the classic version, since trying one on is an ordinary thing to do at that point in a friendship.
This route costs you no measuring, but it depends on how convincing the other person is. Treat whatever they bring back as an estimate rather than a certainty.
What if you have to guess?
The average ring size for women in Canada and the US sits between 5 and 7, with 6 to 6.5 the most common single sizes sold. If you have nothing else to go on, no borrowed ring, no measurement, no help, that range is a reasonable starting point, and sizing to the upper half of it is safer than the lower half: a ring that is slightly loose is easier to live with temporarily than one that will not go on at all.
Even so, a guess is still a guess. Where resizing afterward is possible, it closes the gap a guess leaves open, and whether that is possible at all depends heavily on the ring style, which is worth understanding before you order rather than after.
Does ring size work the same in Canada and the US?
Yes. Canada and the United States use the same numeric scale, in quarter-size steps, so a size of 6.5 means the same thing on either side of the border and nothing needs converting. One whole size in that scale represents a step of roughly 0.81 mm in internal diameter, a small enough difference that it rewards measuring carefully rather than rounding casually.
The United Kingdom and Australia use a separate alphabetical scale instead, running roughly A to Z, so a size quoted there will not line up with a Canadian or US number without a conversion table. Since our rings are made and sized for Canada and the US, a size you measure here applies directly, with nothing to translate.
Why does sizing matter more for an eternity band or a marquise ring?
A full eternity band carries stones the entire way around the shank, with no plain stretch of metal left to cut and reshape. That unbroken circle is the point of the style, and also why resizing one afterward is difficult: taking it in or out can shift the spacing between stones or strain the nearby settings, and a jeweller facing that will often need to rebuild rather than adjust the ring. Getting the size right before you order matters more here than for almost any other ring on the site.
A marquise-cut ring is more forgiving to resize, since its centre stone sits in a setting with plain shank on either side. It carries its own quirk, though: being elongated rather than round, it tends to sit a little higher and can catch more on a knuckle. Sizing to the knuckle, not the base of the finger, matters a little more for this cut than for a plain band.
Moissanite eternity bandfull circle of stones, sized 5 to 8, order ready to wear
Marquise-cut moissanite ringsized 4 to 8 in half steps, more forgiving to resize
Moissanite stud earringsno sizing to guess, a safe first surprise
Moissanite tennis braceletwrist length, not finger size, to get right
Floating solitaire necklacea single stone, no sizing question at all
Moissanite cross pendantone size, gold or rhodium tone
Moissanite Miami cuban link braceletwrist-sized, not finger-sized
You can browse the full range by category — rings, earrings, bracelets and necklaces — or start with our best sellers, which is where most people begin.
Common questions
What is the easiest way to find her ring size without asking?
Borrow a ring she already wears on the hand and finger the new ring will go on, then match its inside diameter to a sizing chart or bring it to a jeweller. It is the most accurate method that does not involve a direct question.
Can I measure ring size with string or a strip of paper?
Yes. Wrap it around the base of the finger, mark where the ends meet, measure the length against a ruler, then divide by 3.14 to get the diameter and match it to a size chart. It is less accurate than a borrowed ring because string stretches and sleeping positions shift the fit.
Does ring size differ from one finger to another?
Yes, noticeably. A ring borrowed from the right hand or from a different finger will not give an accurate size for the left ring finger, so match the hand and finger the new ring is actually meant for.
Is a Canadian ring size the same as a US ring size?
Yes. Canada and the United States use the same numeric scale in quarter-size steps, so a size found or measured in one country applies directly in the other with no conversion. The United Kingdom and Australia use a separate alphabetical scale.
Can a full eternity band be resized later if the size is wrong?
Not easily. Because the stones run the entire way around the band with no plain metal section, resizing can disturb the spacing or the settings, and a jeweller will often need to remake rather than adjust the ring. Getting the size right before ordering matters more for an eternity band than for almost any other ring style.
We answer shipping, returns, sizing and payment questions on our FAQ page. If something is not covered there, get in touch and a person from the workshop will answer. For more on choosing between a full eternity band and a solitaire style, see is moissanite worth it for an engagement ring.
References
The ring-sizing figures in this article follow the published numeric sizing standard shared by Canada and the US, including the roughly 0.81 mm step in internal diameter between whole sizes, rather than any figure of our own. Average size ranges are drawn from published US retail sizing data. Your own measurement, however you arrive at it, is what should decide the order.
