Hetian Jade Interlocking Chi Dragon Bi Disc, carved from Hetian green jade with natural brown patina, using mother-and-child interlocking integral carving technique, the outer ring with high-relief multiple chi dragons, the inner ring with twisted rope patterns, with thick aged patina, diameter 11.5cm, weight 147g, with flexible skilled carving, a classic ancient jade ritual vessel embodying superb openwork jade craftsmanship.