When shopping for a diamond, most people focus on the 4Cs—Cut, Color, Clarity, and Carat. But there’s another characteristic that can quietly influence both a diamond’s appearance and price: fluorescence.
In this blog, we’ll explore what fluorescence means in diamonds, how it’s graded, and whether it’s something to seek or avoid, depending on your goals.
Diamond fluorescence refers to how a diamond reacts to ultraviolet (UV) light—typically by glowing blue. This natural reaction is caused by trace minerals in the diamond’s structure.Fluorescence is not visible under normal lighting but becomes apparent under UV light, such as direct sunlight or black light.
Want to learn how diamonds are formed? Check out our diamond education center.
Fluorescence is graded on the following scale:
View our lab diamond fluorescence filter to compare diamonds by their glow.
Strong fluorescence in D-F diamonds may create a hazy or oily look. These diamonds are often discounted by 10–15%, making them a smart choice if there’s no visible impact.
Fluorescence usually has little effect here. Most diamonds in this range are unaffected in appearance or value.
In this range, blue fluorescence can help neutralize yellow undertones, making the diamond appear whiter. This can increase visual appeal and value—especially for budget-conscious buyers.
Here’s a simple breakdown:
Fluorescence is often misunderstood—but it can work in your favor. The key is knowing how it pairs with a diamond’s color grade and ensuring it doesn’t affect transparency.
At 1ctlabdiamonds.com, you can filter by fluorescence to find the perfect glow for your budget.
Looking for a diamond that glows just right?
– Shop lab-grown diamonds by fluorescence and find your perfect match today.
Need help choosing?
– Chat with a diamond expert or read more in our Lab Diamond Buying Guide.
Lab-grown diamond earrings cost 60-80% less than natural stones. Same sparkle, same chemistry, way better price tag.
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