So, after much hemming and hawing, I decided to replace my homemade one with one of these:
https://wodanesdag.com/th600.html
I've been wearing my hammer of Thor before I even heard of Amon Amarth.
I got mine from here:
http://www.badalijewelry.com/thors_hammer.htm
Which one did you get? Can you vouch for the quality of the pendant from that site?