Diamond Fluorescence Education

Diamond Flourescence

Diamond fluorescence refers to the glow a diamond produces when exposed to ultraviolet (UV) light. This is a characteristic found in some diamonds, and the phenomenon can be polarising; some people find it appealing while others prefer to avoid it. This guide provides an in-depth look at diamond fluorescence, its effects, grading, and how it impacts value.

What is Diamond Fluorescence?

When certain minerals are exposed to UV light, they emit visible light. In diamonds, this emission typically appears as a blue glow, though it can also manifest in other colours. The intensity of the fluorescence can vary from faint to very strong.

Causes of Fluorescence

Diamond fluorescence is primarily caused by the presence of nitrogen and/or boron within the diamond's structure. When these elements are hit by UV light, they can emit visible light, causing the diamond to glow.

Grading Fluorescence

The Gemological Institute of America (GIA) grades diamond fluorescence on a scale ranging from None to Very Strong. Here's a breakdown:

None: No fluorescence observed.
Faint: Minimal fluorescence.
Medium: Noticeable fluorescence.
Strong: Strong fluorescence that can affect appearance.
Very Strong: Very strong fluorescence that has a definite impact on appearance.

Effects on Appearance

The impact of fluorescence on a diamond's appearance varies:

In most cases, fluorescence is not noticeable unless under a UV light.
For some diamonds, especially those with a "Very Strong" rating, fluorescence can make a slightly yellow diamond appear whiter in sunlight (which has UV components).
Conversely, very strong fluorescence can sometimes impart a hazy or oily appearance, especially in daylight.

Price Implications

Fluorescence can influence a diamond's value:

Positive Impact: In lower-colour diamonds (those with slight yellow hues), a medium to strong blue fluorescence might increase the value because it can make the diamond appear whiter.
Negative Impact: In very high-colour diamonds (colourless or near-colourless), fluorescence might decrease the value because of concerns about potential haziness.

However, it's worth noting that the price difference due to fluorescence is typically less significant than other factors like cut, clarity, and carat weight.

Should You Buy a Fluorescent Diamond?

This largely depends on personal preference:

If you're on a budget and considering a diamond with a slight yellow tint, a fluorescent diamond might give you a whiter appearance for a lower price.
If you prioritise a diamond's purity and brilliance and are considering a high-colour diamond, you might want to avoid strong fluorescence to steer clear of any potential haziness.

Tips for Buying

Always View in Different Lights: Before purchasing, view the diamond in various light conditions. If possible, view it under UV light to see the fluorescence in action.
Seek Expert Opinion: Consult with a reputable jeweller or gemologist to understand the fluorescence's impact on your specific diamond.
Prioritise Personal Preference: While guides and experts offer advice, the most crucial factor is how the diamond appears to you.

Diamond fluorescence is just one of many factors to consider when purchasing a diamond. While it can influence appearance and value, its effects are often subtle. As with all aspects of diamond buying, the best approach is to educate yourself, consult with experts, and trust your own eyes and preferences.