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    May 31

    457116864_2ac351ab0aNowadays it is getting more and more difficult to be able to tell a real diamond from a cubic zirconia because these synthetic stones look so much like the genuine stone. If you do not want to spend too much money then it is okay to buy a cubic zirconia that looks just like a real diamond. However, those who spend a lot of money on a diamond would like to know if it is indeed real and that they are not being cheated.

    To really understand why it is easy to get fooled into buying a cubic zirconia instead of a diamond, you should learn more about this particular stone and understand why it is mistaken for a genuine diamond. Zirconium dioxide is used to make cubic zirconia. This synthetic material is very strong, hard, almost flawless, and colorless (though it can also be produced in various colors).

    The main advantage of cubic zirconia is that it is more affordable. Diamonds on the other hand are obviously very expensive and not everyone can afford them. Thus a stone that looks exactly like a diamond with its durable and strong qualities but costs only a fraction of what a real diamond costs is very popular. Nevertheless, no stone can really take the place of a genuine diamond.

    There are many ways to tell a diamond from a cubic zirconia. This is important because there are plenty of diamond and cubic zirconia jewelry and design types and trends that make it difficult to know which is which. Unfortunately, it is easy to be fooled and one can end up spending a lot of money for a fake.

    There are many tests that can be conducted in order to determine the authenticity of diamonds and tell whether the stone is an imitation or not. The old traditional Scratch Test is used because only diamonds are known to scratch glass whereas the fake stone cannot. This test does not produce accurate results because today it has been found that very high quality cubic zirconia can also scratch glass. People are also a little hesitant of damaging their genuine diamonds during the scratch test and lowering the value.

    Real diamonds have facets that make seeing through them almost impossible. The real diamond is not transparent. Therefore if a diamond is placed on top of a newspaper it would not be possible to read the print. The cubic zirconia is transparent and when placed on the newspaper allows you to read the print clearly. However, this test too sometimes can be inaccurate as in the case of a real diamond that has a very shallow cut – it will allow you to read the print!

    Many people try the fog test which is not only easy to conduct but pretty accurate. All you have to do is breathe on the stone. The real diamond will not hold heat and dispense/disperse the heat, instantly clearing up immediately. But if the stone is a cubic zirconia it will be foggy and unclear.  The important thing about this test is to make sure the stone is clean from oils and dirt before testing it. Also, if the stone is loose and not set in any jewelry it will make it easier to test.

    The UV test is also used to determine if the stone is a real diamond or a cubic zirconia.  If the stone is a real diamond then it will show up a blue florescent color when held under black light or UV light. Cubic zirconia on the other hand will not have any fluorescent color. The more fluorescent blue a diamond shows will lower its value.

    Did you know that diamonds weigh less than cubic zirconium? The cubic zirconium weighs almost 50% more than a real diamond. All you have to do is weigh both stones (the stone being tested and a confirmed genuine diamond) of similar dimensions, shape and size on a gram scale and check the weights. The fake should be heavier.

    The Loupe Test is performed by most gemologists to determine the stone’s authenticity. The girdles and facets are closely examined under a magnifying lens. Cubic zirconia will have a waxy look and a genuine diamond will have a clear appearance. It is possible to see if the letters “CZ” appear on the inside. If so, it is clearly a cubic zirconia. In order to understand a diamond better it is important to get familiar with the cut, color, clarity and the carat of a diamond. Diamond certification will help you test and measure the stone.

    3 Responses to “How to Tell the Difference Between a Real Diamond and a Cubic Zirconia”

    1. tonman Says:

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    2. bjkz010 Says:


    3. Black lights Says:

      Not that I cannot afford a real one, I prefer the fake ones because they are so much cheaper and beautiful just the same. They would not be of too much interest for criminals as well.

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