Since ancient times, unpolished jade has been highly valued and regarded as a treasure. Song Yingxing, a scientist of the Ming Dynasty, made detailed records in his book *Tiangong Kaiwu*: "Every piece of jade in its rough form holds incalculable value. The jade within the rough stone, if flawless and measuring one foot in all directions, was taken by ancient emperors to be carved into seals. Such a priceless jade, known as the 'jade worth a thousand cities,' is not easily obtained. Even a flawless piece measuring five or six inches can be crafted into a cup, already considered an invaluable treasure." This shows how precious unpolished jade was in ancient times. At the beginning of this century, Xie Bin visited Xinjiang and observed that Hetian jade "with skin commands an especially high price. The skin comes in varieties like sprinkled gold, autumn pear, and chicken blood. These are jade pieces with their rough exteriors intact, and a single item often fetches hundreds of gold coins. Those who mine it don't say they have found jade, but rather that they have found a treasure." It is clear that even in modern times, unpolished jade remains extremely valuable.