Here are some ready made rings that you can apply a chrome material to.  They aren't for M3, but you can resize them and then go to "Object" and "Change Parent" and parent it to the finger.

http://www.renderosity.com/mod/freestuff/index.php?user_id=121705

http://www.rocky3d.com/jewelry.htm

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi