2. Because the manufacturing process of Zigang brand is complex and difficult, and the stock in history is relatively scarce, Zigang brand really made by Lu Zigang is even rarer. At present, the Zigang brand belonging to "Old Jade" is mostly in the Qing Dynasty or the Republic of China, and the Zigang brand really from Lu Zigang in the Ming Dynasty is almost invisible.
Generally speaking, the imitations of Qing Dynasty are all "purple steel" models, which have obvious jade carving style in Qing Dynasty and are easy to identify. Especially before the appearance of electric tools, the Zigang brand made by jade carving craftsmen with water stool (Tuoji) as a tool has obvious grinding characteristics of Tuo wheel, which is an important feature different from modern jade.
4. The theme of Zigong brand is often endowed with the functions of faithfulness, auspiciousness and evil spirits. It often carves landscapes, flowers and birds, people and animals at the same time. Although it was polished with a jade cutting tool, it still retains the painter's pen and ink interest. On the other hand, while carving poems, it seems that famous painting and calligraphy artists are writing directly on it, carving Zigang's style.