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Where are the four famous jade in China, and which is the best?

The four famous jade in China refer to Hetian jade in Xinjiang, lantian jade in Xi of Shaanxi, dushan jade in Nanyang of Henan and Xiuyan in Liaoning.

Hetian jade is translucent after polishing, oily and shiny, and its hardness is between 5.5 and 6.5 degrees. Hetian jade is the best jade in China.