Without being able to see the details close enough, the black area looks like onyx set in a gold bell (ish) shape with a lightening bolt thingy???...on on one side?
Or is it a skull and crossbone shape?
Oo oo... or... is it "Patrick's" head from Spongebob.
Whatever it is it's downright weird when you consider this groups aversion to personal ornamentation with symbols!!!
Well, they are god's chosen "brotherhood" aren't they? And all brotherhoods need a ring - I spose.