The place where gems are washed is called Taobao yard, which is located in the west of Nongdao Town, Ruili City, about 35 kilometers away from the urban area and covers an area of 60 hectares. This is a world-famous gem metallogenic belt, which stretches about 10 km along the clear Nangu River. It is one of the areas with the richest gem mineralization, and is famous for rubies and sapphires. Nanguhe Taobao Farm is located in the border area between China and Myanmar, with a total length of more than ten kilometers, and is a small tributary of Nanwan River. The upper reaches of Nangu River is a gem belt on the border of China and a part of the gem belt between China and Myanmar. In the past hundred years, dozens of large and small gem fields have been established. Because of its scattered gems, the mining cost is extremely high and it lacks mining value. However, with the erosion of mountains and rivers, many gems, large and small, were washed into the river, sank into the river bed and mixed with sediment. Because they are numerous, as long as they are scoured, they will gain something. Jade commonly sold in Yunnan is jadeite, but the origin of jadeite is not Yunnan, but Pagan area in Myanmar. The mining, transportation, processing and sales of jadeite have always been done by Yunnan people. In an ancient Chinese temple in Amolubo, the ancient capital city of Myanmar, the names of 5,000 jade merchants in China are engraved on the inscription, which is also introduced in jade margin and jewelry. In the middle of the Ming Dynasty, senior eunuchs stationed in Tengchong, Baoshan, specializing in purchasing jewelry. At that time, the route from Yongchang Tengyue to Myitkyina, Myanmar, had been called "Jade Road" and "Baojing Road". At the peak of the trade route from Tengchong to Myanmar, more than 20,000 mules and horses pass through here every day, and Tengchong's jewelry trade accounts for almost 90% of the world's jade trade. Yunnan also has a unique jade Huang Longyu, also called Dragon Pyrite. Produced in Longjiang River, Xiaoheishan Nature Reserve, Longling County, Baoshan City, Yunnan Province. It is a new variety of jade discovered in Yunnan in 2004.