西周紀元始於B.C. 1122, 止於B.C.771. 西周玉器的刀工風格最大特色是單雙斜刀法, 有所謂45度大斜刀法, 此法至漢以後即失傳. The style of the carving for Western Zhou Dynasty is noted for its single and double slant incised carving which is known as the forty-five degree big slant carving and the technique has been discontinued after the Han dynasty. Most of the Western Zhou jade carvings are seen with mastery workmanship and streamline curves which are greatly appreciated by connoisseur collectors. The present object is a round corner rectangular yellow jade plaque. The four corners are decorated with 45 degree slant incise line phoenixes. There are round corner rectangular hole and round hole on the four sides to imply that this jade plaque may be used as clothe decoration.
- quality of jade: 8
- rareness: 8
- historical and cultural significance: 9
- workmanship: 10
- condition: 10