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Both of my labeled examples have some amount of sparkle also - very small and fine, but it's there. They are not Thuri-level finishers for me, but they can get close enough to give a very good shave...

Here are my two Silkstones, both labeled examples. A couple other characteristics are the slightly mottled surface pattern and the distinctive sawcuts. (I've seen examples with and without visible...

No way to say for sure, as Peter mentioned, but I do have a labeled Silkstone that shares the same naturally formed bottom. The other characteristics fit also (slight sparkles, slurry color)....