Yes, using an existing ring is one of the easiest ways to determine your ring size, provided the ring already fits the correct finger comfortably.
Simply measure the inside diameter of the ring and compare it to a ring size chart. Alternatively, many jewellers and online retailers offer printable sizing guides that allow you to match your ring against a chart.
For the most accurate result, make sure you're measuring a ring worn on the same finger you intend to wear your new ring on, as finger sizes can vary between hands and fingers. If you're unsure, using a ring sizer is still the most reliable way to confirm your size.

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