Also, when you activate a bloodstone, if you go to check it you don't actually receive a "Bloodstone" (like something called a "Bloodstone" in your item list), you receive equipment of some kind. You get the following items if you activate all the bloodstones and check them:

Promist Ring
Anklet
Shield Armor
N-Kai Armlet
Black Hood
Venetia Shield
(I think that's all of them)