Finding Your Ring Size
Ring size is the detail most often got wrong, usually because it was measured at the wrong time of day or with the wrong method.

Measuring at home
Wrap a strip of paper snugly around the base of the finger, mark where it overlaps, and measure the length in millimetres — that is your circumference. Compare it against a standard conversion chart.
Measure the finger the ring will actually be worn on. Your dominant hand is usually slightly larger, and fingers are not symmetrical between hands.
When to measure
Fingers change size through the day and with temperature. Measure in the late afternoon or evening at normal room temperature — never when cold, straight after exercise, or after a salty meal.
Take the measurement two or three times on different days and use the largest reading.
Getting the fit right
A correct ring slides on with mild resistance and needs a gentle tug over the knuckle. If it spins freely it is too big; if it leaves a deep mark it is too tight.
Wide bands sit tighter than narrow ones, so go up a half size for anything above about 6mm. Very large stones can also need a slightly larger size to rotate correctly.
If it is a surprise
Borrow a ring they already wear on that finger and have it measured, or press it into soap to take an impression. Failing that, ask someone whose hands are a similar size to try on a sizer.
If you have to guess, guess large — sizing down is a simpler and less visible alteration than sizing up. Our first resize is complimentary either way.
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