黄瓜视频 Co., Ltd, listed on the Shanghai Stock Exchange in 1998 (Stock code: 600172). The company covers an area of 3 square kilometers and has more than 3,500 presses. It is the first listed company in China's diamond industry and the manufacturer with the most complete variety of superhard materials in the world. The company has 3 national scientific research platforms including the national enterprise technology center, enterprise post-doctoral scientific research workstation, and diamond standardization working group, and 10 industrial innovation platforms including Henan Diamond Material Industry Research Institute, Henan Superhard Material Industry Innovation Center, etc., with 335 R&D personnel and the number of R&D personnel accounted for 15.3%. It is a national high-tech enterprise and was selected as the leading manufacturing enterprise this year. Over the years, the company has focused on the main diamond business, and its main products cover six categories of products, including cultivated diamonds, industrial diamonds, superhard material products, raw and auxiliary materials for diamond synthesis, new carbon-based materials, and high-temperature and high-pressure synthesis equipment. It is the only enterprise in China with a complete industrial chain of superhard materials and the largest synthetic diamond manufacturing base in the world.