Having trouble determining the right ring size for you? Here is an easy way finding out, without the need for a jeweller:
You will need a strip of paper 1/2″ wide, and 5″ long. Wrap the paper around the finger to be sized. Slide the paper up to the knuckle, since the ring must be large enough in order to slip on and off over it.
Then mark the paper where the long end overlaps. Now use an accurate ruler to measure the length of the paper that was wrapped around your finger up to the mark. Finally find your ring size using the following chart. When the measurement is somewhere between two sizes it is recommended to choose the largest one.