This is an Amazing Viking Dragon Ring. In Norse mythology dragons similarly represent great forces of evil, but they represent forces of ending, as opposed to forces of beginning. Norse dragons can be seen to take on an aspect of new beginnings, and of change.
1. Wrap a piece of string around your finger
2. Mark the string where it overlaps to form a complete circle
3. Measure the length of the string
4. Compare your measurement with the chart to determine your ring size