This lecture explores the sustainable nature of natural stone, a material with a material cycle that includes occurrence, extraction, design, implementation, processing, deconstruction, and re-use. The incredible range of textures, colors, and patterns of natural stone, along with its physical properties, has made it a fundamental building material. The lecture delves into how natural stone, with its inherited knowledge of ancient building practices, can enrich the discussion on sustainable architecture. International experts discuss the efficient use of raw materials, waste reduction, repair, re-use, and circular economic processes in the context of working with stone today.