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Yer, I can't remember where I read it. Certainly my vintage and new BBWs are quite different in terms of the density of the garnets. There is probably quite a great variation in that still today. The...

Don't quote me on it, but I think as they go deeper and deeper into the mines, the properties of the rocks change - that makes sense to me, but I'm not geologist.

Perhaps, nothing that would make a huge difference though I don't suppose? I guess some bevel setters leave much deeper scratches than others, mine seems to be quite slow but polish at the same time....