The attribute "diameter" refers to the outer diameter.
The following designs are available:
Meaning Iron Cross:
The Iron Cross is closely associated to Germany since here it represents the highest military commendation. It was founded by emperor Friedrich Wilhelm III. of Prussia in 1813 during the war agains Napoleon and consists of silver rimmed iron. It was awarded in all later wars up to Worldwar 1. As opposed to the swastika the iron cross was never removed from the german iconography.
Meaning Templar / Knights Cross:
The "Templar's Cross" (also "paw cross" or "lily cross") was only worn by the elite of the templar knights. The tips of the cross (paws) stood for the connection of intellectual power to the bravery of the knights through the cross of christ.