One of the few aspects of the jewelry industry that is standardized is ring size, though many national systems are in use. The US uses a numeric system from 1-13. The UK has an alphabetic system from A-Z. The European system is numeric from 38-70, representing the interior circumference in millimeters. dvb sizes are listed in the US system but can be sized to UK or European standards as required. The most common sizes for women are 6 and 7, and for men 10 and 11.