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This stone reminds me of The Pearl, The story where a poor man finds a freakish gigantic pearl but ends up only gleaning pain and suffering from it. Whatever you do with this stone, I fear that...

Normally I would completely agree with you. The thing that, in this case, gives me pause is that I believe someone buying an Escher in this condition (mint?) is probably not buying it to sharpen...

Opinions vary, naturally.

If that were mine I would leave it on the shelf. Wait, on second thought, I wouldn't even dare to tempt the evil witch Gravity. I'd leave it on the bottom shelf...of a...