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Stone is same color doesn't have any layers.will have saw marks side of the hone.
Only sparkles(kinda )when it wet. don't have better word .

KEES if you can take a close up pics or make the stone wet and took pics may help more. hard to say from side view.

IN pics Bottom one is so called brown Escher.
As you can see they all have exact same labels.
i am not sure how clear pics will be or can you figure it out differences colors of the stones.
I do...

CF stands for Charnley forest. Seller thought he is selling CF in reality it wasn't.

Small stone you are talking about is different stone. it s origin from England.
it seems like glass broken and spread inside the stone. this stone is low grit stone.
i bought one and guy names CF...