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Ring Size Chart

I have tested many versions and found that it is nigh on impossible to get an accurate measurement by directly measuring your finger with paper or string, so my recommendation is to use an existing ring that fits and this chart, or get measured with a professional ring sizer. I have one at my pop-ups if you are close by.
Be sure to measure the inside diameter and keep the ruler centered and level:
Measure the ring diameter - ring size tool
Ring Size Chart