Usually there is no oil specially used to maintain jade. The best way to maintain jadeite is to take more jadeite with a little oil. Usually poor quality jade is easy to dry and lose water. Haoyu doesn't need oiling. But badger oil was used in ancient times, and Hetian jade played with it all the year round to have the effect of patina. The operation is also very complicated. In fact, the best way for jade is human fat. If other methods use fats and oils, they also rely on human fats and oils, for example

There are two kinds of jade, soft and hard. Usually jade refers to nephrite, and jadeite also has a popular name-jadeite.

Nephrite is a kind of hydrous calcium magnesium silicate with hardness generally below 6.5, excellent toughness, translucent to opaque, and fibrous crystal aggregate. Emerald is sodium aluminosilicate, with hardness of 6.5-7, translucent to opaque, granular to fibrous aggregate, dense and massive. The two jades are similar in appearance, and the proportion of jadeite (3.25-3.4) is larger than nephrite (2.9-3. 1). According to "Tengyue Local Records" written by Qing Jinshi Cun Kaitai, "Tengyue is a collection of jade articles, made into utensils and sold to various provinces in Yunnan. Top grade jadeite is mostly sent to eastern Guangdong, Shanghai, Fujian, Zhejiang and Kyoto.

Jade is a special mineral with sociality and treasure, which was screened and confirmed by the ancients in the process of making tools with selected stones for tens of thousands of years. Shuo Wen Jie Zi interprets jade as "the beauty of stone is jade". In Ci Hai, jade is simply defined as "a beautiful stone with moist luster".