Whether you are selecting a ring for yourself or to give as a gift, it is essential to obtain a size that will be comfortable and snug. The ring should just barely slide over the largest part of your finger (usually the knuckle). Ring sizes generally increase with hot temperatures, high humidity levels and a high diet of salt. You also do not want to measure a finger in cold tempertures because the finger shrinks. Be aware of these factors as you measure the ring size. For the most accurate measurement, measure the finger at the day's end when the finger is largest.

If you're buying the ring for a surprise, you can ask your partner's mother or friends if they know the correct ring size. Or, secretly take one of their rings and use the Ring Sizer to get a measurement.