Icthus means fish in Greek.  It has been used for centuries as a symbol of recognition by believers in times when it was dangerous to do so.  It is made in titanium and has options to be made in titanium or black zirconium.  Anodized titanium can be any of the anodized colors available.  While it is possible to anodize an outer surface, it would easily scratch, so it's best to be done only down in the grooves.  This ring has a rough scratch inner finish for contrast.  Note that cobalt chrome cannot be anodized, and black zirconium will remain black.  The ring is comfortable to wear and can be engraved on the inside.