I have not received the sogtae so I would not know for sure.... but this is what I understand from some teachings I received (pardon me - the memory might be a bit rusty.... so do keep checking, this is not gospel!).
Is this the same as a "heart jewel"? If so, I believe it is symbolic of a very sacred bond (a heart connection?) you create by accepting Dorje Shugden's practice and being committed to it for the rest of your life; simultaneously, of course, you receive the supreme protection of Dorje Shugden until you are enlightened.
I wonder - are we permitted to wear this without having received initiation? And are there any negative effects if we do?