Catch Those (UV) Rays

Talking fluorescence with your customers

You know all about the 4 Cs (carat weight, cut, clarity, and color) when you’re looking for the perfect stone selection for your store, and chances are, many of your customers are at least familiar with them, too. It’s sort of Diamonds 101, and many consumers have at least touched on the unofficial course before embarking on the hunt for an engagement ring.

But there’s more to selecting the perfect stone than the basics. And while your clients need not know everything, you as a retailer should be well-versed in the factors that influence a diamond’s quality, so you’ll be ready to answer any questions that come your way.

One such factor is diamond ultraviolet fluorescence. According to a GIA Diamond Grading Report, fluorescence “refers to the strength, or intensity, of the diamond’s creation to long-wave UV, which is an essential component of daylight.”

For some time now, fluorescence hasn’t exactly been regarded with favor. Despite the fact that it can’t be seen or detected under normal circumstances (how many long-wave UV lights do you come into contact with on the daily, really?), many jewelers have considered this characteristic to alter a diamond’s appearance, making it seem oily, or hazy.

Not so, according to GIA. The association’s studies show that, for an overwhelming majority of diamonds, the presence of fluorescence—regardless of its strength—has no widely noticeable effect on its naked-eye appearance. Those that do appear hazy or oily thanks to this attribute do exist, but in very small numbers: Less than 0.2 percent of the fluorescent diamonds submitted GIA showcased this undesirable trait.

Noting a stone’s fluorescence—it’s a fairly common occurrence, with 25 to 30 percent of stones submitted to GIA possessing it in some degree—is important knowledge for a retailer, and information that should be passed along to their customers. But, as long as the diamond isn’t in the small minority of those with an altered appearance, there’s no reason for this characteristic to be considered anything but interesting. If you’re unsure about the status of the diamonds in your store, it might be a good time to test them out before the holiday rush, or have them appraised.

And if you do happen to have a customer who, say, authenticates a lot of oil paintings (a practice where blacklights are often used), selling them a diamond with fluorescence could be very cool, indeed.

Leave a Reply

You must be logged in to post a comment.

About JCK Insider

JCK Insider gives you the inside scoop from influencers in the JCK Community and insights to enhance your JCK Events experience. For tips, trends, behind the scenes, and designers to watch – the JCK Insiders will provide it all.

Become an Insider

By submitting your information, you agree to the Privacy Policy


Follow Us on Instagram

This error message is only visible to WordPress admins

Error: API requests are being delayed for this account. New posts will not be retrieved.

There may be an issue with the Instagram Access Token that you are using. Your server might also be unable to connect to Instagram at this time.

Error: No posts found.

Make sure this account has posts available on

Error: admin-ajax.php test was not successful. Some features may not be available.

Please visit this page to troubleshoot.