Buying a ring online: the sizing checklist

Buying a ring online removes the one thing a shop gives you for free: somebody putting a steel sizer on your finger and telling you the answer. These checks replace it, and they take about fifteen minutes in total.

Which sizing system is the listing actually using?

Establish this before anything else, because every other number depends on it.

“Size 7” means different rings in different markets. “Size 54” is not a size in the American sense at all; it is a circumference in millimetres, and it happens to be a US 7. A bare number in the teens might be Japanese, Chinese, or a diameter in millimetres.

If the listing does not say which system it uses, ask. A seller who cannot immediately tell you is a seller who has not thought carefully about sizing, which is itself useful information.

Then send them your inner diameter in millimetres, with the word “diameter” attached. It is the one value that means the same thing in every country and cannot be mistranscribed into a different scale. Any jeweller anywhere can work from it, and it removes an entire category of error from the transaction.

Have you checked the band width and profile?

These two details change the size you need, they are almost always stated in the listing, and almost nobody reads them.

Band width first. Anything 5 mm or wider needs about a half size up from your bare finger measurement, and 8 mm or wider often needs a full size, because a wide band grips more of the finger and has further to travel across the knuckle. The reasoning is in the wide band guide.

Profile second. A comfort-fit band is domed on the inside so it touches less of the finger, and it runs about a quarter to a half size large, meaning you order that much down. A flat or standard-fit band sizes true.

These two adjustments run in opposite directions, which is why a wide comfort-fit band often fits at your plain measured size. Apply one and not the other and you will be a full size out. If the listing does not state the profile, assume standard fit and ask.

Can this specific ring be resized?

Ask before you buy rather than after, and get the answer in writing.

Tungsten carbide, ceramic and most titanium rings cannot be resized at all. They are replaced under warranty or not at all, which makes your measurement the only line of defence. Full eternity bands and tension settings usually have to be remade rather than adjusted, at close to the original price.

Gold, silver and platinum can be resized straightforwardly, typically by up to two sizes in either direction. If a listing is vague about the metal, that is worth clarifying too, since “silver-tone” and “sterling silver” are very different propositions at the repair bench.

The complete picture is in can you resize a ring.

What are the returns and resize terms?

Three numbers to note down before you pay, because they are rarely on the product page.

How many days is the returns window, and does it run from order or from delivery? Fourteen to thirty days is typical, and the difference between those two start dates matters when a ring is made to order.

Who pays return shipping, and is the item insured in transit? Sending an expensive ring back at your own risk is a meaningfully different proposition from a prepaid, insured label.

Is one free resize included, and for how long? Many jewellers include one on engagement rings, sometimes for thirty days and sometimes for a full year, and a great many of them do not advertise it. Ask directly.

Have you measured twice, by two different methods?

One measurement is a number. Two measurements that agree is a decision.

Measure a ring you already own on a calibrated screen, which is the most accurate method available at home because you are measuring a rigid object against a known scale. Then cross-check with the on-screen finger gauge on the finger the ring is actually for.

Do both in the evening, at room temperature, with warm hands, because cold hands can read a full size small and that is the most common reason rings arrive too tight.

If the two land within half a size of each other, order. If they disagree by more, find out why before spending money. Usually it means the reference ring came from a different finger than you assumed, which is a five-minute problem now and an expensive one later.

Does the delivery timeline leave any room?

Made-to-order rings take weeks. A resize takes two to three more on top. Those two facts together catch out a lot of people buying against a date.

Work backwards from the occasion rather than forwards from today, and add a fortnight of slack for the possibility that the first ring needs adjusting. If the timeline does not survive that arithmetic, either order sooner or choose something in stock.

Ask about seasonal load too. The weeks before Christmas and the start of summer wedding season are the busiest on any workshop’s bench, and quoted turnarounds stretch accordingly.

What should you do the moment it arrives?

Before you put it on, photograph the ring on a plain surface from a couple of angles.

If there is ever a dispute about condition, or if you need to return it, dated photographs taken before first wear settle the question immediately. This takes thirty seconds and costs nothing.

Then try it on in the evening, with warm hands, and run the removal test: it should come off with a gentle twist rather than requiring effort or soap. If it does not, act inside the returns window rather than hoping it will feel different next week. It will not, and the window closes faster than the hope fades.

The pre-checkout checklist

Run it before you click buy rather than afterwards. Every line on it is either free to check or free to ask, and between them they account for most of the reasons rings get returned.

What if it arrives and it does not fit?

Act inside the returns window. It is the cheapest option by a wide margin and it expires quickly, often before people have finished deciding whether they are imagining the problem.

Test properly before you decide. Try it in the evening with warm hands, and use the removal test rather than how it feels going on. A ring that goes on easily but needs soap to come off is too small regardless of first impressions, and one that spins freely at the base is too large even if it felt fine in the first hour.

The order of operations, including what to do once the window has closed and what to try before paying for a full resize, is in what to do when a ring does not fit.