Throughout the ages, the magical East China Sea crystal has made countless sorrowful sages like springs, and the flowers at the end of the pen – Chu Ci, Han Fu, Tang Poetry, Song Ci and Yuan Qu, have a large number of chapters to admire and sing. In the Song Dynasty, "I am in the mountains, I want to live in Donghai County." Poetry Su Dongpo has been to the East China Sea twice in his life. His poems have been mentioned in the East China Sea 9 times and crystals in 4 times. For example, in "Nian Nujiao", "In the Crystal Palace, a sound blows off the flute." The great writer of the Ming Dynasty, Wu Cheng'an of the Huai wave, came to the East China Sea Huaguoshan to conceive the creation of "Journey to the West", for the first time to create a beautiful and illusory "East Sea" "Crystal Palace", although it is whimsical, but it is not made out of thin air, it is obvious that the magical crystal of the East China Sea has brought the romance and legend that has been popular in the world.

Donghai crystal quality technical requirements (1) sensory characteristics of raw materials. Generally it has a crystal structure and is excellent in engraving and polishing. Fully transparent or translucent, glass luster, common colors are colorless, brown, purple, green, yellow, etc. (2) Characteristics of the original cooking. 1. Mohs hardness: 7.2. Density: 2.66 g/cm 3 . 3. Refractive index: 1.544 to 1.5553. 4. Silica content: greater than 99.99%, total impurity content less than 20ppm, aluminum content less than 15 ppm. (3) Quality characteristics. 1. (2) The crystal is relatively complete, the surface, the ribs and the angle are clear, and the crystal growth pattern is obvious. (3) Contains a small amount of gas, liquid and solid three-phase inclusions. (4) Crystal crystal face and pit are often accompanied by brown, brown, and green "swallow mud" composed of fine meteorite and chlorite minerals. 2. Quality level: The quality level is divided into three levels.

Apply to：
Producers within the scope of protection of the East China Sea Crystal Geographical Indication Products may apply to the Quality and Technical Supervision Bureau of Donghai County, Jiangsu Province for the use of the “Special Mark for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.