Do your diamonds glow?

Do your diamonds glow?  Years ago, fluorescence was discovered within diamonds and it’s a factor that many folks know very little about.   You can see a diamond’s fluorescence with a black light, but since the sun produces ultraviolet light, you can even see traces of the fluorescence during the day.

What is Diamond Fluorescence?

Diamond fluorescence, in its most simple form, is the effect that ultraviolet (UV) light has on a diamond. Fluorescence is the visible light that a diamond emits when it is exposed to the UV rays. Under the right conditions you can see fluorescence in about 35% of gem quality diamonds. Out of the majority of diamonds that fluoresce, 95% fluoresce the color blue.  The next most common color is yellow and any other color would be considered rare.

Many jewelers traditionally associate fluorescence with a negative value factor.  The reasons to why are speculative, one being that a blue fluorescing diamond will appear to be higher in color than its true body color. Meaning that the blue fluorescing diamond is graded lower and valued lower than its appearance.  The argument is understandable for the yellow fluorescence because the diamond would appear more yellow in the direct sun than would the color grade would suggest.

The scale for a diamond’s fluorescence is None, Faint, Medium, Strong, Very strong. On occasion, when a diamond has Very strong fluorescence, it appears oily even under normal light conditions – this effect always brings a negative value range of 1%-10% .  On the other hand, a slight premium of 1%-3% price increase for diamond that with a lower color grade that does have blue fluorescence.

At Windsor we believe fluorescence is just a factor, not positive or negative.  It could leave quite an impression if you frequent environments that use black lights or if you want little better color when sun hits your diamond.  It isn’t an imperfection, it’s just a factor in your diamond.  We do have a ultraviolet light at Windsor and we’d be more than happy to show you your diamond in the dark.


For more diamond knowledge, visit our resource.