UPDATE02/12: The ring has been redone and should hopefully work with silver. As usual any other metal other than silver will give a more faded less detailed result due to the printing process. Get it in silver for the high detailed look, or in other metals for the antique battle worn look.
"An assassin's ring with a gap in the bottom to activate a hidden blade.
The ring itself is about 20mm wide, that should translate to 10¼ ring size in the US."