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I would guess that it is an Escher Gem. I am more than likely wrong, but I wont get rid of it until someone pulls it from my cold dead hands.

I took a shot on an Ebay auction. I think I got really lucky. I got a Hone that is Yellow Green in color that is 5" by 2.5" and .75" thick. The rubbing stone is a blue color that is .75" by .75" by...