MacLowlife wanted another thread to crop up in this forum, I also just happen to have been having a PM discussion about the engraving of a ring.

Please explain signet rings in relation to traditional Highland attire: the rules, laws, etiquette, etc.
What counts as a signet ring?
Do the assorted group rings count as signet rings?
Is this some sort of heraldry, and if so does Lord Lyon regulate them in Scotland?

I know nothing.