Is there an online resource that lists all the locations you can find these and other high-tier gems, such as King's Tear? HolyGuardian80 (talk) 05:53, November 15, 2019 (UTC)
Try this:
https://gamefaqs.gamespot.com/pc/922154-neverwinter-nights-2/faqs/55624
and maybe this:
https://gamefaqs.gamespot.com/pc/922154-neverwinter-nights-2/faqs/46019
I am also working on an extensive walkthrough guide for the original campaign that will, among other things, specifically answer your question. I've been workig on it for quite some time and expect it will be ready in the next month or two.Raelind (talk) 00:44, November 16, 2019 (UTC)