Fluorescent diamonds emit a visible glow, typically blue, when exposed to UV light due to specific particles within the stone. While high fluorescence levels can sometimes cause a milky or hazy appearance, this is uncommon. Generally, fluorescence doesn't affect a diamond's beauty or sparkle and can even enhance the whiteness of lower color grades (I-L). These diamonds are often sold at a lower price, offering good value for those who don't mind the fluorescence or find it visually appealing.

The impact of diamond fluorescence on appearance and value has sparked intense debate within the diamond trade, with conflicting opinions regarding its effects.

Fluorescent diamonds sometimes receive negative perceptions due to:

1. A belief that non-fluorescent diamonds are inherently purer.
2. The potential for strong fluorescence to create a hazy appearance in rare cases, affecting clarity and brilliance.
3. Concerns that GIA lab grading lights, which emit a small amount of UV radiation, may artificially enhance the color grade of fluorescent diamonds.

However, those who challenge this negative view argue that:

1. UV light is not prevalent in most viewing environments, making color grading under realistic lighting more relevant.
2. Haziness in highly fluorescent diamonds is exceedingly rare.
3. Fluorescence can sometimes enhance a diamond's color appearance, adding to its beauty

A 1997 GIA study concluded that fluorescence generally does not affect a diamond's face-up appearance. Surprisingly, it found that diamonds with strong blue fluorescence were often perceived to have an even better color appearance when viewed table-up compared to non-fluorescent diamonds.

Impact on prices

Historically, strong fluorescence in diamonds has resulted in lower prices compared to their non-fluorescent counterparts. Higher color diamonds (D-H) without fluorescence typically command a 10-30% premium over similar diamonds with very strong blue fluorescence.

Conversely, lower color diamonds (I-N) with strong fluorescence can be up to 5% more expensive than their non-fluorescent counterparts. This price difference in lower color grades is likely attributed to the perception that blue fluorescence can mask yellowish tints.

Should I buy a FLUORESCENT Diamond?

Your satisfaction with your diamond purchase is paramount. Fluorescence can significantly enhance a diamond's color and appearance and shouldn't be automatically dismissed as undesirable. The milky, oily, or hazy look sometimes associated with fluorescence is extremely rare.

Ultimately, the decision is personal, but seeking advice from a diamond specialist before purchasing is always recommended to ensure you make an informed choice.