Metech International Limited, an investment holding company, operates lab- grown diamond business in the People's Republic of China, Singapore, and internationally. It operates through Lab-grown Diamond and Supply-Chain Management segments. The company manufactures and distributes lab-grown diamonds; and provides general wholesale trading of metal products, as well as management and advisory of recycling, and supply chain services. It offers water and wastewater solutions, which includes sewage treatment, water pollution control, resource recycling service technology, environmental protection consultancy, and technological development services. The company was formerly known as Centillion Environment & Recycling Limited. Metech International Limited was incorporated in 1992 and is based in Singapore.