Does Your Diamond GLOW? All About A Diamond's Fluorescence

Welcome to The Clear Cut Classroom, where we take deep dives into all things diamonds and jewelry! Ever notice that glow-in-the-dark effect in some diamonds? There is one key factor that we need to be careful to not overlook, fluorescence. That is the glow the diamond gives off under long wave UV light. Read more to find out if it affects your diamond’s appearance!




We love glow sticks and we love the glow-in-the-dark effect when cosmic bowling or at a night concert, but we’re not sure if we love that kind of glow coming from our diamonds. If you’ve started your diamond research, then we should all know about the 4 C’s to look out for in diamonds. These characteristics are Color, Cut, Clarity and Carat weight. But there might be one more factor that you should be looking out for. It’s a unique feature but is very useful to know when diamond shopping and this a diamond’s fluorescence. This means that in the composition of some diamonds, they will emit a glowing light that fluoresces under UV light. You won’t be able to catch it in natural lighting but. . . 


Diamonds Fluorescing Under UV Light 


Does it affect your diamond’s appearance? 

The range in which we measure a diamond’s fluorescence is from None, Faint, Medium, Strong and Very Strong. Staying in None to Faint fluorescence is the best option for any diamond. We even suggest going up to Medium fluorescence, especially in diamonds that are lower in color grades like (K and onward) because it can help counteract the yellowish tinge. Just be very careful with Strong and Very Strong fluorescence showing up in diamonds. These diamonds will glow very brightly under UV lighting but in incandescent light or sunlight, it can make the stone look a little foggy or milky. And we definitely don’t want that. 


Fluorescence Scale from GIA


Trust us at The Clear Cut to keep an eye out for fluorescence in diamonds. Remember NONE to FAINT and no complaint! 


Are you ready to explore the world of diamonds for your engagement ring? Book a call with a gemologist to start designing today!