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The quality evaluation of turquoise should be considered from the following aspects:
Color
High-grade turquoise, that is, turquoise for jewelry requires a standard sky blue, followed by dark blue, blue-green, and requires uniform color. Those light blue, gray-blue turquoise can only be used as carvings, and tan Turquoise has no process value.
2. Relative density and hardness
High-grade turquoise is required to have a high density and hardness, that is, a density of about 2.7 g/cm3 and a Mohs hardness of about 6. Because the density value directly reflects the degree of weathering of turquoise, as the degree of weathering deepens, the relative density of turquoise decreases, the hardness decreases, and the color quality also decreases significantly. Turquoise with a relative density of less than 2.4 g/cm3 and a Mohs hardness of less than 4 is generally stabilized before it can be used.
3. Purity
Turquoise often contains impurities such as clay minerals and calcite. These impurities are mostly white. They are called white brains in jade. The turquoise of white brain development is easy to burst and the quality is obviously reduced.
4. Special pattern
Turquoise is the only jade that can be ground together with surrounding rock. When the pattern of the surrounding rock and jade turquoise has a certain symbolic meaning, the product will be well received.
5. Block
In the sales of turquoise ore, there are certain requirements for the block size. The general principle is that the color quality is high, and the block requirement can be lower. For example, in the United States, the original blockiness of light blue and light green turquoise is not less than 10 mm and weighs 7 to 28 g; the sky blue turquoise can be thinner, but the weight should not be less than 4 g.
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