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Is Your Diamond Real or Cubic Zirconia (CZ)?

A simple test YOU can perform to answer that question

The dot test
This simple visual test will tell you. Diamonds reflect light back out through the top surface (called the table) of the diamond. Cubic Zirconia, or CZ for short, is transparent and reflects the light differently.

  1. Draw a small dot on a clean piece of paper.
  2. Place the diamond / cubic zirconia in question face down on the dot.
  3. Look through the bottom. If it is a real diamond you should not be able to see the dot; the image should be distorted. If your stone is a cubic zirconia (CZ) the dot will become a circle that is clearly visible.

This simple test can help you determine if a diamond is real but you should take your jewelry to a qualified jeweler or gemologist and allow them to test your diamonds for absolute verification.


If it glows under black light is it real or fake?
Have you seen your diamond 'glow' when under a black light or in a bar? Some people say this means the diamond is real, while others say a diamond that glows is fake. The reality is that both can be true: Real diamonds can glow under black light, or ultra violet light, a property of many different minerals called fluorescence. It is natural characteristic of diamonds and can vary in intensity from not visible to strongly visible where it glows very bright colors. This property is measured and declared on all major lab reports.