The registration address of yalong hard materials ltd., henan province, is located in chujiang road, zhengzhou city, where the registration authority is the market supervision authority of zhengzhou city, and is represented by li dongjie. It covers the development, production and sale of single crystals of diamonds, grinders, grinders of diamonds, sand wheels of diamonds, polishing, grinding fluids; the processing, sale and maintenance of jewellery; import and export operations for the production of raw materials, mechanical equipment, instrumentation, spare parts and related technologies for scientific research at the enterprise. In the case of licensed projects, permission from the relevant sector should be obtained before they can be operated