When did the striped dragon on the ancient jade start?

According to the information of Hotan Jade Information Network, this jade dragon with back pattern began in the Neolithic Age.

The appearance of dragon patterns on jade articles began in the Neolithic Age, and after thousands of years of changes, until the Qing Dynasty, it formed the unique characteristics of each era. The earliest jade carving dragon pattern in China can be described as Hongshan Culture in the Neolithic Age. The characteristics of dragon pattern in Neolithic age are: the dragon's head is like a horse's head, the snout is stretched forward, slightly upturned, with no ears, long horns hanging down from the back, and the knife method is simple and rough.

During the Spring and Autumn Period and the Warring States Period, male lines squeezed out double negative lines around the dragon body, highlighting the outline of the dragon. The characteristics of Yulong in the Spring and Autumn Period and the Warring States Period: the dragon pattern is long and zigzag, resembling the "S" of English letters, and the dragon body is decorated with valley patterns, which is a new pattern in the Spring and Autumn Period and is widely popular in the Warring States Period. The pattern of lying silkworm commonly used in the Spring and Autumn Period is prominent, with strong three-dimensional sense, exquisite swordsmanship and more vivid.