Looks like you guys have it sorted, but I'll chime in for anyone else with the same question! I think most characters have come to the logical conclusion that the stones are important to the people who lost them and are probably needed to turn them back to normal, if that's possible at all. I've been referencing them ooc as soul stones, but the characters have no way of knowing for sure that's what they are. However, again, the character could come to that assumption through logic, especially given the nature of magic and enchantment that they all grew up with. Someone with little experience with enchantment might actually be faster with that conclusion, since they might not be aware that a soul has never been known to take a physical form.
That's a long-winded way of repeating what's already been stated, haha.