Please make sure you choose the correct size ring. To measure your finger, wrap a thin strip of paper or piece of string around the base of the finger you want to measure.
With a pen, mark the point on the paper or string where it overlaps, forming a circle on the finger. Measure the length of the paper or string using a flat ruler, from the starting point to the pen mark. If your hands are cold or hot this can affect the sizing, so measure when your hands are at normal temperature.