Exact same thing happened to my GMTII Ceramic clasp. I tried JB weld but it did not hold up. There is not enough surface area for JB to bold. I gave up and ordered replacement clasp from Andrew..
You can get the WM (watchmaterial) pearl here:
http://www.watchmaterial.com/viewitem.asp?idProduct=1800
You can also get the insert with pearl here:
http://www.watchmaterial.com/viewitem.asp?idProduct=366
I plan modify my noobmariner's crown and CG and was wondering if someone can tell me the crown thickness of a gen so I can match it with some grinding? Thanks.