Identifying and Evaluating the quality of zircon mainly depends on the following five factors:

(1) Color: The most popular colors of zircon are colorless and blue and the value of blue zircon is higher. The colorless zircon should be as transparent as that of diamond, without any hue of grey or brown. If with the hue of grey or brown, we can optimize it by the method of heat treatment. But the zircon of heat treatment will turn back to its original appearance after a while, so we need to pay attention to this feature. Evaluating the color of zircon, the most important is to observe the clarity, transparency and uniformity of color. For the zircon whose hue is dark, shininess is low, crystalline is turbid and color is uneven, the evaluation is usually low.
(2) Clarity: For the colorless and blue zircon, watching by eyes, it should not have any defect. The zircon has fragility, easily worn down, we should also watch carefully whether the surface edge has abrasion phenomenon or not, if it did, the value will decrease. All the zircons with nebulous inclusions are not high-quality zircons.
(3) Cut Proportion: The beauty of zircon mainly lies on its high dispersion and proper cut proportion. The better the Fire is, the higher the quality is. If not cutting according to the standard proportion, though the carat increases, the value decreases.
(4) Directionality: As for the cut direction of the zircon, generally speaking, the optical axis should be vertical to the table, which can get the best color effect. Especially the blue zircon, we should pay more attention, or it will affect the blue color of zircon.
(5) Carat: After meeting the requirements above, the bigger the carat is, the higher the value will be.

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