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It is much easier to flatten a stone face, than to flatten the edges.

A Surgical Black will finish the same as a Translucent if the density of the stones are the same.

Most new stones are flat...

I know the surgical black has a gravity of 2.50 and translucent a gravity of 2.55, just wondering if that is enough of a difference to make the translucent a better finisher

Nope, they are natural...