why does my diamond glow under black light

Overall, diamond fluorescence should not be a major factor in the purchase of a diamond since its effects are negligible, if not slightly positive. The exception would be to exercise caution in purchasing a diamond with Strong fluorescence in D-F color diamonds or Very Strong fluorescence in G-H color diamonds(which do not possess enough body color to offset the degree of fluorescence). Every Lumera Diamond displays the fluorescence grade as determined by the, using the following scale:
Very Strong, Strong, Medium, Faint, None For a precise summary of the effects of fluorescence on price, use the chart below. The effect on price varies depending on the degree of fluorescence, diamond color, and clarity. For example, according to the chart, an E color diamond of VS1 clarity and Strong Fluorescence will tend to sell for 3-5% less than a like diamond with no fluorescence.


Alternatively, a J color diamond of any clarity and Medium fluorescence will typically sell for up to 2% more than a like diamond with no fluorescence. While clarity has no bearing on the appearance of color and fluorescence, it does impact price. This is because customers who gravitate towards higher clarity tend to be more adverse to the presence of fluorescence. Questions about fluorescence or other aspects of a diamond? Ask a for answers. A consultant will answer any questions you have, and if you like, search for diamonds on your behalf that match your criteria. , or email. Next: Whether you are buying a diamond new from a jeweler or used from a pawn shop, it is always wise to know the telltale signs of a fake diamond.


While a professional will have the definitive opinion as to whether a diamond is authentic or not, there are ways to detect a fake. Fake diamonds differ from in many ways. An ultraviolet light, also known as a black light, will reflect differently in most diamonds, thereby making it a useful tool in detecting fake diamonds. Buying a diamond is a large investment, one that may even be handed down through your family. You'll want to be sure that you're getting the real thing. Hold the diamond in question under a long wave UV light (also called a black light). If the diamond reflects a blue fluorescence, it is most likely authentic. Be aware that while the majority of diamonds on the market will have a blue glow under UV light, high quality diamonds will not.


The UV light method should be performed along with other tests to detect a fake diamond. Know that cubic zirconia will glow mustard yellow under a UV light. Glass will have no glow at all. Familiarize yourself with the other methods of detecting fake diamonds, such as the reflection colors within the stone, the weight, the quality of the setting and the wear and tear on the stone itself. Know that the final word on detecting a fake diamond is a professional appraisal. A certified and experienced gemologist will have the knowledge and skills needed to determine without a doubt that the diamond in question is authentic or a fake.

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