If you already have a ring that you use, or if the person you're giving the ring to always wears one, use that ring as a reference.
Using a ruler, check the inside diameter of the ring and look for the diameter equivalent in the table below. An example: if your ring has an internal diameter of 16.5 mm, it will correspond to size 12. If the diameter you measured was halfway between two sizes, choose the larger one.
If you don't have a reference ring to measure to understand what your size is, follow this simple trick.
Take a tape measure , even a strip of paper or a cotton thread is sufficient. Wrap the tape measure around the knuckle of the finger you want to wear the ring on and mark the point where the two ends meet. At this point, unroll the ring and compare the circumference you just measured with the equivalent size.
Consult the size conversion table starting from the diameter or circumference.
