Moiraine’s blue stone is a dig at Marion Zimmer Bradley.
When RJ was working on the first Conan book, he got the movie script and was told to stick as close to it as possible (though he did alter some things and later got approached with “man, I HATE what they did to your book”). After the book was published and the movie out, he one day got a letter from Marion Zimmer Bradley threatening to sue RJ for copyright infringement because one of his characters had a (blue) stone hanging on her forehead. RJ then sent a letter back referring her to the studios and the original script in which the stone appeared. The lawsuit never happened and Moiraine has a blue stone on her forehead.
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