Talk:The Sister of the South/@comment-172.15.65.145-20130407160301/@comment-25775410-20141220130703

It's mentioned in the second series, at the end of The Shadowlands. Lief says that all gems have a little power of their own but compared to the great gems, they were worthless. I can't recall if there was anything earlier than that since I haven't read the books properly in a while.

EDIT: The ruby in the fake belt dims a little in the Cavern of The Fear when there's evil nearby.