Turquoise quality evaluation standards: 1) Color: High-porcelain blue (sky blue) is best, followed by blue-green and green; purer colors are better; 2) Porcelain degree: High-porcelain turquoise has a smooth, ceramic-like surface with high density and quality; 3) Iron lines: Clean turquoise without iron lines is most expensive, but even iron lines (like Wulan Flower) have unique beauty; 4) Origin: Turquoise from Shiyan, Hubei (Zhushan, Yunxi) has the best quality; 5) Clarity: No impurities or cracks is ideal; 6) Size: Same quality, larger is more precious. Distinguish natural turquoise from treated products (polymer-filled, dyed, electroplated). Natural high-porcelain blue turquoise can cost hundreds to thousands per gram.

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