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If you’re unsure of your ring size, simply take a ring that you know fits you well, take a ruler to the ring and measure the ring diameter (from one side to another in a straight line) this measurement in millimeters is your size.
If you do not have a ring that fits you well, you can also use a soft measuring tape, and wrap it around your finger. This will give you your ring circumference size. Consult the ring chart I have available to check the corresponding diameter size