Claddagh Ring Ettiquette
1--On the right hand, crown in heart out, the wearer is free as the birds in the sky. If you want her, go a courtin'.
2--On the right hand, crown out heart in, the lass is spoken for, so lay off.
3--On the left hand, place of choice, heart in crown out, she is happily married for evermore.
They are available in gold, and with stones in the center of the heart as well. The James Avery version is probably the most easily available one in Texas.
ETA: For those who don't know what the Claddagh Ring Story is, here's a link:
http://www.potgold.com/claddagh.htm