The Gem Book is a written literature that was apart of a trade by Flint and White Diamond.
Description[]
It is a thick, vintage leather-bound book with an orange cover, and a pinkish gemstone centered on the front cover with gold details surrounding it. There also was a yellow bookmark peeking out of its pages. The book is written in "Gem Glyph". The contents describe numerous details regarding Gem anatomy and biology, including Fusion, creation, and Corruption.
It is unknown who the original author is.
History[]
The Gem Book was given to Flint in exchange for Starswirl's Journal, in means that Flint wanted to leave an object that could help the Harmony Gems in their endeavors to cure Corruption. It is unknown as to the current whereabouts of the book, but most likely it's still with the Harmony Gems.