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Some will use a small fine diamond plate. They are about the size of a credit card. But im not too sure if that messes with the garnets? I think thats what is in a Coti. But i will step back and let...

Looks like a Coti to me but im no pro. Also, they dont always glue a bbw to a cotie. Sometimes is just a dark stone not worth honing on. Hopefully someone with more experiance jumps in.