obviously it's not "polishing" in the usual sense, it's crushed stone that's just been smoothed a bit (probably by tumbling), they came in a dusty bag on but not as dusty as some I've seen, I rinsed them, dried thoroughly then sprayed them lightly with Krylon Satin Lacquer a few times which made them even more finished as if they were houseplanters, they almost are all very pure white.
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