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And if you look at the bottom of the page, it lists them as 2.50+ specific gravity. You could have a Surgical Black stone at 2.51 and a Translucent at 2.55.

Not that your blade will know the...

Black and Translucent are the same, the difference is literally coloring of the stone. Novaculite is novaculite, it's %99 silica if I remember right. The only difference between a Soft, Hard, or True...