Ordering a ring online without knowing your exact size is one of the most common (and most avoidable) reasons a piece ends up back in its box waiting for a resize. The good news: you don't need a jeweler's shop to get a reliable measurement. With a strip of paper or a ring you already own, you can land on your correct size in about five minutes. Here's how to do it accurately, plus a real US size chart and a few rings to try once you know your number.
A ring that's too loose can spin around your finger or slip off entirely, while a ring that's too tight can be uncomfortable to wear for long stretches and difficult to remove, especially around the knuckle. Because most rings can only be resized within a limited range without weakening the metal or disturbing the stone setting, starting with an accurate measurement saves you a trip back to the jeweler and gets you wearing the piece sooner. This is especially true for eternity bands and channel-set rings, where the stones wrap most of the way around the band and resizing options are more limited than with a plain band.
This is the classic at-home approach, and it works well as long as you use a material that won't stretch.
A few things that make this method more accurate: use paper rather than string when you can, since string has a bit of stretch that throws off the reading. Wrap it snugly enough that it still slides comfortably over the knuckle rather than pulling tight. Repeat the measurement two or three times and use the most consistent result.
If you already own a ring that fits the intended finger comfortably, this is usually the most reliable at-home method, since it removes the guesswork of wrapping something around a finger that can swell or shrink in the moment. Lay the ring down flat and measure the inside diameter, edge to edge, in millimeters with a ruler. Then match that number to the diameter column on the size chart below.
If the ring has a wide band, measure the inside diameter at the narrowest point, since a wide band sits slightly differently on the finger than a thin one. And if it's a ring worn on a different finger than the one you're sizing for, keep in mind that finger size varies from hand to hand and finger to finger, so use it only as a rough reference rather than a final answer.
Once you have a measurement in millimeters, use the chart below to find the closest matching US size. These are standard industry measurements used across most US jewelers.
A quarter-size change in the US system works out to roughly 0.4mm of diameter, or about 1.26mm of circumference, so don't worry if your measurement falls between two lines. Round to the nearest quarter size, and if you're genuinely stuck between two sizes, the general rule of thumb is to size up rather than down.
A few small habits make a real difference in how reliable your measurement ends up being:
Once you know your number, here are a few pieces from the current collection that are available across a range of sizes:
IGI Certified Diamond Half-Eternity Band
18K white gold, channel-set diamonds. Available sizes 5.5 to 10.
$9,149
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10K Yellow Gold Diamond Bypass Ring
Infinity-style crossover band. Available sizes 5 to 10.
$3,752
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10K Yellow Gold Diamond-Cut Ring
Round and baguette diamonds. Available sizes 7 to 9.5.
$3,234
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10K White Gold 3-Stone Engagement Ring
Brilliant and baguette-cut clusters. Available sizes 6.75 to 7.25.
$3,556
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Measuring an existing ring that already fits well tends to be the most reliable at-home method, since it isn't affected by finger swelling in the moment the way wrapping a string or paper strip can be. Combining both methods, and averaging your results, gives you extra confidence before ordering.
Yes. Fingers swell slightly in heat and after exercise, and shrink in cold weather. For the most typical everyday fit, measure in the evening when fingers are at their largest, and avoid measuring right after a workout or in very hot or cold conditions.
Lay the ring flat and measure its inside diameter, edge to edge, in millimeters with a ruler, then compare that number to a ring size chart. For a wide band, measure at the narrowest point of the inside diameter.
Most jewelers recommend sizing up to the larger of the two, since a ring can be pinched narrower more easily than it can be stretched wider. This is especially worth keeping in mind for wider band styles, which tend to fit more snugly than thin bands.
Yes. Weight fluctuations, pregnancy, temperature, and age can all shift finger size over months or years. If it's been a while since your last measurement, it's worth remeasuring before ordering a new ring rather than relying on an old size.
Ready to find your size? Explore the full jewelry collection.
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