The ideal option is to get sized by a jeweler to determine your ring size. If you are unable to do so, the following guide can assist you in finding your ring size if you have a ring that fits your finger - For best results, we recommend using the app RING SIZER. The second option is to measure the size in centimeters. Wrap a piece of paper or thread around your finger. Mark and cut the spot where the edges meet. Measure the length of the cord with a ruler