Sorry to hear about the ring accident Vance. Porcelain is very hard, harder than steel. It will can easily roll or chip the edge of a knife blade if impacted with any significant force.

Tell your jeweler you want a Rockwell hardness of 58 and all will be well. It will roll and not chip next time you drop it and you can just steel it out <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

Seriously, I hope the jeweler takes care of you like they should.