I know one of the threads had degenerated into dice talk a little while back. I don't know if a search would find the hijacked thread. I made/machined some steel dice myself due to my line of work. I found the prices they want for these things unreal. Mine hold up well and seem to roll truly random. They do sound extra cool when you roll a bunch of them.
I remember Tesral had said he encountered the stone dice, and feared to use them due to their fragile and expensive nature. I don't know if I would trust them either.
Yet another thread degenerated into talking about casino dice being precision instruments.