Zhanguo Red Agate (Banded Agate)

Zhanguo Red Agate is a specific type of banded agate, a cryptocrystalline variety of quartz. It is primarily classified by its unique color and pattern combinations, with the most sought-after being the 'red and yellow silk' variety, which displays vivid, distinct layers of both colors. Other classifications include 'Dong' (frozen) material, which has a higher translucency, and single-color varieties. The stone's name connects it to the Warring States period (475-221 BC), as its appearance is consistent with period artifacts, lending it immense cultural and historical value. In traditional Chinese culture, red is a color of celebration and luck, while yellow is historically associated with imperial power and nobility, making Zhanguo Red Agate an emblem of both. For collectors, the primary evaluation criteria are color, pattern, texture, and craftsmanship. The most valuable pieces feature intense, pure 'blood' red and 'imperial' yellow colors with clear, flowing, and aesthetically pleasing bands. The texture should be fine and smooth, free of cracks, impurities, or excessive crystalline structures known as 'fan.' As a relatively recent discovery in the modern market, its value has appreciated rapidly, making high-quality specimens a noteworthy investment. When collecting, one should prioritize pieces with unique patterns and exceptional color saturation.