The first is top grade topaz, the color is dark yellow, soft and even, the texture is dense and delicate, tough, moist and smooth, translucent, oil-wax-like luster, basically no flaws, cracks, impurities and so on.
Second-grade topaz, the color is from light yellow to deep yellow, softer and evener, the texture is dense and delicate, the oil has a waxy luster, occasionally smashing, cracking, impurities and so on.
Three-grade topaz, the color is yellowish, soft and uneven, the texture is dense and delicate, waxy luster, common sputum, crack, impurities and so on.
The division of colors is also general and it is not possible to find strict boundaries. Therefore, there are many features of Hetian jade color that cannot be defined, and can only be used as a reference when collecting. And collecting a piece of jade, seeing color is only one aspect, more importantly, looking at the texture of jade. If you only look at the color, you may use other yellow nephrites as Hetian jade.
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