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How to identify jade in different periods in ancient times
Due to the limitation of cutting tools, Neolithic jades are irregular in shape, or round in periphery, or uneven in thickness, uneven in wall surface, or with cutting marks, or inconsistent in width on both sides, or deviated in perforation, and inclined in hole edge. Hongshan Culture jade meat has a thin edge and a blade shape, which is naturally lighter and less in color, only reddish brown, rust color and grayish black. The outer edge of Liangzhu culture jade is thin and the inner edge is thick, and the Qin color is mostly foggy gray. Jade in this period is generally sapphire, emerald, gray jade and pale yellow jade, which are characterized by plain and clean surface, polished and bright.

The Shang and Zhou Dynasties witnessed the development of imperial calligraphy, which was a special ritual vessel for nobles. The size of jade articles in this period is smaller than that in Neolithic Age, and they are all round, with smooth walls, equal thickness of inner and outer edges, rounded outer edges and regular holes drilled on both sides. In Shang dynasty, jade was plain; In the Western Zhou Dynasty, there were no patterns on the big wall, and exquisite patterns of dragons, phoenixes and birds were carved on the small wall. Wall decoration is often carved from a combination of a wide yinxian and a thin yinxian. The wide yinxian line is obliquely dug into a slope shape, with many lines, natural and smooth lines and soft and dynamic shapes. The jade materials used are mostly Xinjiang blue, blue, white jade, Nanyang jade and xiuyan jade.

During the Spring and Autumn Period and the Warring States Period, jadeite jade was widely used as decorations and buried jade, as well as as as a token for ceremonial occasions. Xinjiang is mostly green, white and jasper. The wall diameter is generally within 10 cm. The diameter of the wall not used for tombs or ritual vessels is between 15 ~ 25 cm. In spring and autumn, the wall is very thin, and the thickness is about 1 cm. The surface of the Warring States city wall is divided into one, two or three concentric circles, and the inner and outer areas are carved into a double dragon pattern, while the middle area retains the traditional valley pattern. The inner and outer edges are engraved with negative lines, and the cross section is triangular and prismatic. During this period, there were some innovative productions, such as carving outline jade and carving vivid animal images in the inner hole or outer edge. Carving techniques generally use a combination of thick and thin lines, with thick lines less and thin lines more, and lines with Mao Kou. The cutter is sharp and straight, with deep incision and sharp corners. The valley pattern mastoid is full and well-proportioned, and the valley pattern is made by engraving the negative line on the breastplate pattern.

Jade articles in the Han dynasty followed the style of the Warring States period with slight changes. Jade is still dominated by white, blue and jasper, but the shape of the wall has been enlarged, and some of them are more than 30 to 50 centimeters in diameter. There are many patterns of dragons, phoenixes and birds carved through. Valley lines on the wall, plain lines are large and sparse, convex and shallow, and the upper part of the lines is round. The edge of jade is widened, and the vertical side section is square, which is obviously different from the triangular vertical side in the Warring States period. At the same time, combination patterns are more popular, and some decorations have auspicious words. By the Eastern Han Dynasty, the wall was thickened and the facade of the outer edge was slightly curved, but the number gradually decreased.

With the rise of antique jade articles in Song Dynasty, jade articles imitating Warring States and Han Dynasty appeared. Jade has rounded corners, no leading edge, dense and fuzzy grain nails, insufficient rotation of grain lines, and a round ridge at the end of grain lines, which is different from the thin yinxian lines used in the Warring States period. Jade carved with dragon pattern has a long forked tail and the forked tail rolls inward, which has the characteristics of dragon pattern in Song Dynasty.

Jade articles in Yuan Dynasty are mostly imitated from Tang Dynasty, mostly small, with few large walls, and are mainly used for wearing. Most of them are only carved on one side, with thick walls, sparse lines and irregular arrangement. Carved animals on the wall, animals have the style characteristics of Yuan Dynasty handicrafts. Jade carvings in Yuan Dynasty were rough, with deep knives and often outlined blades, and there were many exquisite carvings.

The number of jade articles in Ming Dynasty is more than that in the previous three generations. Choose more sapphire and a small amount of jasper. Most of the bodies are relatively small, with common relief plain patterns, as well as many valleys and moiré patterns. Chest nail pattern is round and large, slightly flat, often leaving traces of tubular drilling shell. Jade in the Ming Dynasty was mainly used for wearing. Sculpture is more casual and rough.

In the Qing Dynasty, there were many small jade walls with small perforations, and a double wall with a ring sleeve appeared in the middle. The decorative patterns on jadeite jade are geometric patterns, Ji Xiangwen patterns and figure patterns, which are lifelike. During this period, the court, the ruling and opposition parties and the people were very popular. Antique jadeite jade is realistic and very beautiful when it is dry. By the end of the Qing Dynasty, the quality of jade was poor, the workmanship was rough, and the carving was irregular, and the quality of craftsmanship was greatly reduced.