spellbook gems/items

[Weasel]

does identify on the spellbook itself show it?

[Alberich]

i think it is hinted at vaugly in the o­nline help for some of the spells.  If you click o­n the spell descrip o­n the webpage (this o­ne) royal library, every book that requires an object to be held to read (like firewind) is listed as Object: xxx under the min mana bit.