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I have not seen the thread on BB.
For me the pics do not show ell enough the stone to be able to tell. The surface looks finely spotted which is not what eschers are, may be that is dry slurry mark...

For me this one apart from the label, is not well represented in the pictures to be able to tell.
I am looking at the face of the stone and is hard to tell if it is escher or not.
I have a dark...