Difficult story request

Ok, I'm finally breaking down and asking for help.

I'm trying to find a story that I read here before, the problem is I cannot remember the Author, Story Name, or characters.

What I can remember from it is the protagonist get a family (I think) ring that allows them to use a mirror to transport them to a different realm, also giving them power to form crystal buildings and such. I believe there are 3 books in the series but I'm not sure.

Any help would be greatly appreciated