I'm not sure, but I'd say it *looks* like Crystsl Keep to me. Chessex is usually more rounded.
I'm guessing you mean Crystal Caste? Could be, although the color of the die that came out of the soap doesn't look like the color of the translucent die in the photo in the Paizo store.
I'd like official word from Paizo, if possible. Brilliant as I am, I always seem to post questions about products after business hours on Friday so they're buried in the fora by the time the staff is back to work. I'll have to bump it back up after the holiday.
I gave this soap to my nephew for his birthday. (He has a 17th-level elf ranger that runs with my husband's dwarf fighter.) When he got the die out, it was really pretty, and he'd like a whole set so I was wondering who the manufacturer was to order some.
Of course, it could be that they just have a big vat of assorted overstock dice from anyone and have no idea who made the die in any particular soap. But I thought I'd ask.