What are the methods for distinguishing between diamonds and zircons?

September 30, 2021

Diamonds are the hardest substance in nature, so there is nothing to mark the diamonds. If you can mark them, they are never diamonds. Zircon is very similar to the appearance of diamonds, but zircon and diamond prices are far apart. Some unscrupulous merchants use zircon to pretend to be a diamond, deceiving consumers and making huge profits.



Diamond is the hardest known material. Only diamond can score diamonds with a Mohs hardness of 10; zircon has a Mohs hardness of 8; corundum (red and sapphire) is 9; therefore, diamonds can be carved with corundum; Stone can not be carved with corundum, corundum can not be carved diamonds; corundum can be carved zircon.



Zircon has a strong birefringence, that is, it has two refractive indices, and the difference between the two refractive indices is large. This results in a very special optical phenomenon. When observing the finished zircon product with a magnifying glass, it can be seen from the top surface that the bottom surface and the ridge line have obvious double shadows. Because diamonds are “homogeneous”, there will be no double shadows, which can distinguish between zircon and real diamonds.

The specific gravity of zircon is 4.69, while the specific gravity of diamond is only 3.52, that is, zircon is 1.33 times that of diamond. That is to say, two gems of the same volume, the weight is zircon, and the light is diamond. However, the specific gravity is inconvenient to observe and can only be known after measuring with an instrument.

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