The reliability of the mirror test? A lot of people by using diamond scraping the mirror to test its authenticity. Don't do it. This method is not very reliable, fake diamond can also leave scratches. And, you should also don't want to let your diamond by various possible loss. They are hard, but their brilliance is likely to be affected by the scratch. Check the other methods of diamond jewelry authenticity? Breath test how to implement? A safer way is to test your breathing with your diamond jewelry. On a real diamond, o breath, a real diamond condensation evaporation is very quick, while false otherwise. It is important to note that if a layer of oil on the ring, then the test results, it is not absolutely accurate. And the weight of the diamond is not reliable. Of the more popular fake diamond, zircon, is heavier than a real diamond. This with a lot of people think the opposite. With a magnifying glass check my diamond should pay attention to? Your sparkling eyes? Or do you have a magnifying glass? So you can check the top of the diamond. If it fuses in together, is straight, so you hand, is a real diamond. If you are using a microscope, you can even find a diamond of a minor defects or spots. It is almost impossible because these artificial created, so they can prove that diamond is true. Because these so-called inclusions almost impossible to replicate, they provide the authenticity of the diamond. A real diamond will react to ultraviolet ray? What is the best way to distinguish true and false diamond jewelry? Most diamonds when placed under uv light to blue. May I have your diamond have to blue? So, congratulations, you have a real diamond. If after all the tests I'm not sure my diamond is true or false? Where I can rest assured to buy diamond? You are always welcome to professional jewelry consulting or make an appointment on our experience.