The Diamond Throne by David Eddings

In this fantasy novel, a knight named Sparhawk returns to his homeland after a decade-long exile to find his queen, Ehlana, gravely ill and trapped in a magical stasis. Sparhawk, a member of the Pandion Order, embarks on a quest to find a cure, uncovering a web of political intrigue and dark sorcery threatening the kingdom. Alongside his companions, including a young squire and a mysterious child, Sparhawk navigates a world filled with danger and deception, relying on his wits, martial prowess, and the power of a mystical jewel to save his queen and protect the realm from impending doom.