Don’t Hate the Fluorescent Diamonds!

What You Need to Know Before Buying

Are fluorescent diamonds bad? The truth is, diamonds with fluorescence aren’t all bad-in fact, some diamonds actually benefit from a bit of fluorescence to enhance their color and overall appearance. But why do luxury brands like Tiffany’s, Harry Winston, and Piaget often avoid diamonds with fluorescence?

In this guide, we’ll explain what is diamond fluorescence, when it adds value, when it can hurt your diamond’s look and price, and how to shop smart for fluorescent diamonds. Get ready to be surprised!

What Is Diamond Fluorescence?

Diamond fluorescence is the visible glow a diamond emits when exposed to ultraviolet (UV) light, such as sunlight. Most commonly, this glow is a soft blue light, but it can sometimes appear yellow or orange.

Approximately 30% of diamonds exhibit some degree of fluorescence. The Gemological Institute of America (GIA) notes fluorescence as an identifying characteristic but does not include it in the main diamond grading factors (the 4Cs: Color, Clarity, Cut, and Carat).

How Does Fluorescence Affect Diamond Value?

Unlike the 4Cs, fluorescence does not consistently lower a diamond’s price. In fact, depending on the diamond’s color grade and the strength of fluorescence, it can sometimes increase the diamond’s value.

When to Love Fluorescent Diamonds: Benefits for Lower Color Grades

If you’re shopping for diamonds with a color grade between I and M, fluorescence can be a hidden advantage. These diamonds often have a faint yellow tint, but the blue glow from fluorescence can mask this tint, making the diamond appear whiter and more colorless under natural light.

Because of this color-correcting effect, many professional jewelers price blue fluorescent diamonds in this range slightly higher-sometimes up to 2% more. So if you want a more affordable diamond that looks closer to colorless, a fluorescent diamond in the I-M color range is a smart choice.

When to Avoid Fluorescent Diamonds: Higher Color Grades and Strong Fluorescence

For diamonds with higher color grades (D to H), fluorescence is generally less desirable. These diamonds are already very colorless, and fluorescence can sometimes cause an unnatural bluish haze or milky appearance under sunlight.

In rare cases, diamonds with very strong fluorescence (about 0.2% of all fluorescent diamonds) can look oily or cloudy, which significantly reduces their beauty and value-sometimes by as much as 15%. If you’re buying a high-end diamond, it’s best to avoid stones with strong fluorescence.

Beware of Dishonest Vendors Selling Fluorescent Diamonds

A cautionary story: A Client once visited Fresh Recollection with her D Color, VVS1 clarity engagement ring. Despite the high-quality certificate, the diamond looked dull and hazy, like it had a permanent oily fingerprint. She only learnt from the jewellers there the reason why it could never be cleaned.

This happens when a diamond has very strong fluorescence causing a milky or cloudy effect. Unfortunately, some dishonest vendors sell these diamonds without disclosing the fluorescence issue, taking advantage of buyers who don’t know what to look for. Always buy from trusted jewelers who are transparent about fluorescence.

How to Shop for Fluorescent Diamonds: Tips for Buyers

• Work with an expert jeweler who understands fluorescence and can guide you to the best diamond for your budget and preferences.

• Avoid diamonds with medium to very strong fluorescence unless you see the stone in person and like its appearance.

• Compare loose diamonds under white paper and natural light to see how fluorescence affects their look.

• Remember that faint to medium blue fluorescence can improve the appearance of lower color grade diamonds.

Conclusion: Should You Buy a Fluorescent Diamond?

Fluorescence is not inherently bad. It can enhance the beauty and value of many diamonds, especially those with lower color grades. However, strong fluorescence can sometimes cause undesirable effects, particularly in very colorless diamonds.

If you want a more affordable diamond that looks whiter, consider a fluorescent diamond in the I-M color range. But always inspect the stone carefully and buy from honest and professional jewellers.