High-grade blue ≠ Top-grade! The value of turquoise is determined by color (high-grade blue > greenish-blue > light white-blue), porcelain-like quality (Mohs 5-6 is excellent), iron lines (natural and winding is beautiful), and clarity. Ulanhua turquoise commands a premium due to its unique iron line patterns, while low-grade material, no matter how blue, is hard to hide. We'll teach you how to quickly judge quality using three methods: "look, touch, and scratch."