There was ‘The Blue Carbuncle’ by Conan Doyle as well to add to the lore of a cursed stone. Seemed more like the greed of people than a stone’s fault. Although I’d rather have the value of the thing than the stone. Good grief, it’s a gauche thing isn’t it?
I think the it’s better off where it is. It doesn’t seem to have harmed the museum.
I've seen the stone on display at the Smithsonian. It's a beautiful rock. The setting is pretty gaudy, but that is not the stone's fault. I think it's in the right place, as well.
And, as the guy who says he thinks it the same stone said, there is no way to prove it.