If you're unable to have your ring measurements taken by a professional jeweler, follow these tips to determine your approximate ring size.
Using a ˝" wide strip of paper, wrap it snugly around the widest part of the finger you intend to wear the ring on. Avoid using string because it may stretch too much.
Mark the point on the paper where it overlaps, forming a complete circle.
Measure the length from the starting end of the paper to the mark.
Match this measurement to the chart below to determine your ring size. For example, a size 6 measures 2 1/16", or 51.5 millimeters, in length.