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I've seen online, but I haven't been able to find an actual confirmation. In Way of Kings, it describes Shin Warriors as being bought and sold by means of small stones. Are those Oathstones?
Those are very similar to Oathstones indeed. You will find out a lot more. But yes, you're on the right track.
Are the quartz and iron in Szeth's oathstone specific to Szeth's in particular, or to oathstones in general?
I'll RAFO that.
If i was holding Szeth's Oathstone would he understand my commands?
Good question, I don't believe anyone has asked it before. No, an Oathstone doesn't have any magical properties whatsoever.