"The Diamond of Darkhold" is a fictional artifact from the Marvel Comics universe. It is a powerful gem associated with the Darkhold, a book of dark magic that contains ancient spells and knowledge. The diamond is often sought after for its ability to amplify magical powers and grant immense abilities to its wielder. In various storylines, the diamond has been linked to characters such as Doctor Strange and Wanda Maximoff. Its allure and potential for destruction make it a significant object in the ongoing battle between good and evil within the Marvel narrative.