Проходит ли диоксид циркония класса 5A проверку с помощью тестера для бриллиантов?

The short answer is no. High-quality 5A zirconia will not pass a standard diamond tester. In fact, that is exactly what makes these testers useful—they are designed to distinguish diamond simulants like cubic zirconia from real diamonds. See our premium 5A cubic zirconia collection to understand the quality we offer, and here is a closer look at why this is the case.

How Traditional Diamond Testers Work

Most common diamond testers are small, pen-like instruments that measure thermal conductivity—how quickly a stone transfers heat. A diamond conducts heat exceptionally well, which is why it feels cold to the touch.

5A zirconia (and all cubic zirconia) has a much lower thermal conductivity than a diamond. When a thermal tester is applied to a cubic zirconia stone, the heat does not dissipate as rapidly, and the device will give a reading that indicates the stone is not a diamond. This is a primary method for identifying a simulant, regardless of its A-grade rating.

The Moissanite Exception

The only common diamond simulant that can fool a thermal tester is moissanite, which has thermal properties very similar to a diamond. The good news for identifying 5A zirconia is that the test is conclusive: it will clearly be identified as not a diamond.

More Advanced Testers

While a standard thermal tester is enough to tell 5A zirconia from a diamond, more advanced multi-testers go a step further. They combine thermal and electrical conductivity tests to differentiate between a wide range of stones, including natural diamonds, lab-grown diamonds, moissanite, and cubic zirconia. These devices will display a result specifically for “Cubic Zirconia,” leaving no room for doubt.

Bottom Line

Because 5A zirconia is a diamond simulant with different physical and chemical properties, it will not pass a diamond tester. A standard thermal conductivity tester will correctly identify it as not a diamond, and more advanced models can specifically identify it as cubic zirconia. At CZDIA, we are committed to transparency about our materials and help our customers understand exactly what they are purchasing.