Wenwan walnuts are walnuts with collection value formed after selecting and processing special types and characteristics of walnuts. The craze for collecting art and antiques gradually began to heat up in the early 21st century, and gambling on green leather became popular in 2006. At that time, an ordinary Wenwan walnut cost dozens of yuan, while walnuts of good variety, large size, and perfect pairing only cost a few hundred yuan.

After 2009, more and more people are playing, and the quality is getting higher and higher. Although the output has increased, good walnuts are still very popular, and the price rises every year. In the Wenwan walnut circle, walnuts over 45 mm are considered high-end walnuts. Since the price has doubled, the prices of some good-quality special-shaped walnuts such as three-ribs (commonly known as big ben), four-ribs, conjoined, and eagle mouths The number ranges from tens of thousands to hundreds of thousands.

According to incomplete statistics, the price of Wenwan walnuts has increased more than ten times in six years. Before 2006, the price of a single walnut was only more than 100 yuan, and you could buy a good variety with a diameter of more than 40 mm for 200 yuan. In 2012, a good walnut cost thousands. Some walnut merchants said that the best walnuts More expensive than BMW.

In the autumn of 2012, in Beijing, the price of Beiqingpi started from one thousand yuan. As a primary marketing case of Wenwan walnuts, the popularity of Beiqingpi was actually just a manifestation of the walnut investment craze.