Question about spectres

Hi all,
I have a couple of questions about how spectres gem works:
1) Let’s say I have a spectre binded inside a gem, can i unbind it and bind another kind of spectre?
2) if i have already upgraded that gem making it a for example a 4 link gem, when i will unbind the spectre what will happen to the links inside the gem, does the gem will remain a 4 link gem spectre or it will become a basic 2 link gem spectre?
Thanks for ur replies
:)

Yes to both answers, you remove it by disenchanting.

Thanks for fast reply.
Regarding my second question u mean the gem remain a 4 linked gem?
:-P