A copy of the Diamond Sutra was printed in Tang-dynasty China, making it the world's oldest dated printed book. Diamond Sutra: The Diamond Sūtra is a Mahāyāna Buddhist sutra from the genre of Prajñāpāramitā sutras. Translated into a variety of languages over a broad geographic range, the Diamond Sūtra is one of the most influential Mahayana sutras in East Asia, and it is particularly prominent within the Chan tradition, along with the Heart Sutra. May 11, 868. Wiki link