Interesting enough, her blood wouldn’t go in the incision where the ingredients would go. Instead, it actually goes into the center gem. I was a bit jealous that the modern world had readily accessible gems, like sapphire. When I made my grimoire, I only had a scant few available at the time. In the end, I went with Rubies. I would have preferred Amethyst or Alexandrite. But those were quite inaccessible, being hoarded by the remnants of the Roman empire. 