Actually yes I took similar ideas with grindstones too. But yeah I agree, it isn’t its full function. I will probably work on it more to make it clearer.
*Edit: I am working on them now 
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Updated the post. Now with extra row and gemstones.
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Oooh! Aaah!
NOW I get which kind of refining it is^^ Good job! The last row is definitely my favorite.
I very much prefere number 9