Can you determine a ring size online?

FindMyRingSize.com hosts a flash app that allows users to find their size using a standard credit card as a scale. A list of ring sizes by millimeter and inches is available online at DiversSilverShack.com.

When getting a ring made to size, use a ring that already fits the wearer as a guide. However, if this is not possible, finger size is measured by wrapping a piece of paper or string around the finger and then matching it to the appropriate size on a sizing chart. Most jewelers offer resizing after the purchase is made if the size of the ring is slightly off.