This oval purple gem is flat on one side. Images of strange runes seem to materialize and dissipate within it.

A lore gem affixes to your forehead and can be easily removed (requiring a standard action either way). While it is worn, you can better focus your mind and memory, gaining a +2 competence bonus on Knowledge checks, though you must spend a full round in contemplation to gain this bonus. This is a continuous effect and requires no activation.
Additionally, a lore gem acts as a spellbook, allowing a wizard (or any other spellcaster who requires a spellbook) to record spells into and prepare spells directly from the lore gem. The gem holds up to thirty spells of any levels, and recording a new spell into a lore gem requires the normal amount of time and expense. You can also erase an existing spell as a standard action. A newly created lore gem is empty of spells, but a lore gem recovered as treasure might have spells recorded within, at the DM’s option. If so, the value of the item should increase as if it were a spellbook.

Prerequisites: Craft Wondrous Item, legend lore, secret page.
Cost to Create: 3,500 gp (plus 500 gp for base item), 280 XP, 7 days.