When you hear “diamond fluorescence,” it might sound like it refers to radiation or glowing light. However, in the world of diamonds, fluorescence refers to how a diamond reflects light and the colors it emits under ultraviolet (UV) light. This unique feature can significantly affect the appearance of a diamond. So, should you consider diamond fluorescence when making a purchase? Let’s dive into what it means and how it affects your choice of diamond.

What is Diamond Fluorescence?

Fluorescence refers to the glowing effect a diamond has under UV light, such as from a black light. When a diamond is exposed to UV light, its molecules absorb the shorter ultraviolet wavelengths and emit a longer one, creating a visible color. The result can be a glowing version of primary colors like blue, red, green, yellow, and purple. This fluorescence can vary in intensity, with some diamonds glowing more strongly than others. Around 25-35% of diamonds exhibit some level of fluorescence.

Here’s how fluorescence affects the diamond’s appearance:

• Yellow Diamond: Fluorescence can make it appear whiter, which is considered a positive aspect, as it enhances reflectivity.
• Colorless Diamond: Fluorescence may cause it to appear slightly blue, which can reduce transparency and make the diamond less appealing.

Diamond Fluorescence Scale

Fluorescence is graded based on its intensity, which can affect the diamond’s visual appeal:

• None: No fluorescence is visible in the diamond.
• Faint: A weak presence of fluorescence, barely noticeable.
• Medium: A slight hint of fluorescence that can be seen under UV light.
• Strong: A noticeable fluorescence that may impact the diamond’s appearance.
• Very Strong: A significant glow that can overpower the diamond’s natural color.

Diamonds with stronger fluorescence can look different depending on the lighting conditions, so it’s important to consider how the stone will appear in various settings.

Is Diamond Fluorescence Important?

The presence of fluorescence doesn’t necessarily make a diamond better or worse. It all depends on the diamond’s characteristics, personal preferences, and the level of fluorescence. For diamonds with a J-M color grade, fluorescence can improve the appearance by masking some of the yellowish tones, making the stone appear whiter. However, for diamonds with higher color grades (D-F), strong fluorescence can make the diamond appear “over blue,” which some people might consider less desirable.

Does Diamond Fluorescence Affect Value?

Yes, fluorescence can influence a diamond’s value. Generally, diamonds with strong fluorescence, especially colorless diamonds (D-F), are priced lower due to the perceived “cloudy” or milky appearance that can be caused by fluorescence. However, for diamonds with lower color grades (such as I-M), fluorescence can enhance the visual appearance, making them look whiter and improving their overall value. In this case, fluorescence may even increase the price by 2-3%.

For those looking for a more affordable option, diamonds with medium or strong fluorescence may offer a great value without compromising too much on appearance.

How Can You Tell if a Diamond Has Fluorescence?

It’s difficult to spot fluorescence with the naked eye, especially in faint or medium fluorescence diamonds. Professional gemmologists use UV light to identify fluorescence, as it’s only visible under specific conditions, such as UV exposure. When fluorescence is strong, it can be noticeable in some diamonds, especially those rated D-F in color. However, in everyday settings, the effect is usually subtle and often goes unnoticed by the average observer.

If you’re concerned about how fluorescence will impact the diamond’s appearance, it’s a good idea to request images of the stone under different lighting conditions before making a final decision. At GoldSouk / GoldSouq, we provide detailed information and guidance to help you make an informed purchase.

Diamond Fluorescence Shopping Tips

Fluorescence can be a personal preference rather than a strict factor in purchasing decisions. Some people love the glow it gives a diamond, while others prefer the clean, pure look of a non-fluorescent stone. Here are some tips when shopping for a diamond with fluorescence:

• Consider the Color Grade: If you’re choosing a diamond with a lower color grade (I-M), fluorescence can help mask yellowish tones, making the diamond appear brighter.
• Check the Fluorescence Level: For high-color diamonds (D-F), look for stones with faint or no fluorescence to avoid an overly blue or hazy appearance.
• Understand the Lighting: Fluorescence is most noticeable under UV light, so keep in mind that in everyday lighting, you might not even see the effect.

The 4 Cs (Cut, Color, Clarity, and Carat) are more important factors to consider for diamond quality and value. If fluorescence doesn’t drastically affect the stones appearance in your desired setting, you may choose to prioritize other aspects like diamond cut or clarity for better performance.

Diamond Fluorescence FAQs

Is a diamond with fluorescence good?

A diamond with fluorescence isn’t necessarily “good” or “bad.” It’s a matter of personal preference and how it affects the diamond’s appearance. Faint fluorescence is generally not noticeable, but strong fluorescence may impact the stones look, especially in high-color diamonds.

What should the fluorescence be in a diamond?

Fluorescence grades range from None to Very Strong, and the ideal grade depends on the diamond’s color and your preference. Strong fluorescence may enhance diamonds with lower color grades, but it can negatively impact colorless diamonds.

Do all diamonds exhibit fluorescence?

No, only 25-35% of diamonds fluoresce. It’s not a common trait, but it can significantly influence the diamond’s appearance when present.

Does diamond fluorescence make diamonds look whiter?

In diamonds with a yellowish hue, fluorescence can make the stone appear whiter by counteracting the yellow tones. This can be a desirable effect for diamonds with a lower color grade.

Are fluorescent diamonds cheaper?

Yes, in most cases, diamonds with stronger fluorescence are cheaper because they are seen as less desirable, especially in colorless diamonds. However, diamonds with strong fluorescence in lower color ranges may actually cost more due to the improved appearance.

Should you buy a diamond with fluorescence?

The decision to buy a diamond with fluorescence depends on your personal taste. Fluorescence is subtle and often imperceptible in everyday wear. If you prefer a clean, clear appearance, you may want to avoid strong fluorescence in colorless diamonds. However, if you’re after a more affordable stone, fluorescence in lower color diamonds could be a great choice.