Emerald (unofficial)

The Emerald was the crystal that was set in the hilt of Legenimor's Sword. After Graham removed it from the hilt, he used it as part of the disenchanting spell from Ye Olde Book of Enchantments - Causes and Cures. Graham used it to protect himself from the Evil Enchanter. He also used it on the Disciple of the Cloud, a bridle, Hagatha's Suitor, and finally Valanice herself.