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2014 April

Diamond fluoresence and why you need to know about it!

By | Diamonds, Engagement Rings | No Comments

Have you ever noticed the term “Fluorescence” on a GIA Diamond Grading Report? Did you know that some, but not all, diamonds show effects under ultraviolet light? For most people who purchase diamonds, fluorescence will be a non-issue, but some might be confused by the term.

To write this blog post I began by Googling it to find out what would appear on the internet –  because we all know what is written on the internet is the absolute truth! I came up with plenty of material, – some good, some not so good. I then decided to go to the GIA website and see how they described it to the consumer. Below are commonly asked questions, and helpful answers from GIA researchers who have studied fluorescence in depth.


What is diamond fluorescence?

Diamond fluorescence, in its most simple form, is the effect that ultraviolet (UV) light has on a diamond. When you stand under a blue light or ultraviolet light, sometimes you can see your whites get brighter or your teeth appear to glow. This is the same effect the diamond has under the UV rays. Fluorescence is the visible light that a diamond emits when it is exposed to the UV rays.

On a GIA Diamond Grading Report, fluorescence refers to the strength, or intensity, of the diamond’s reaction to long-wave UV, which is an essential component of daylight. The light emitted lasts as long as the diamond is exposed to the ultraviolet source.

Is fluorescence common?
Yes. Of the diamonds submitted to GIA over the past decade, approximately 25% to 35% exhibit some degree of fluorescence. However, only 10% of those show strengths of fluorescence that may affect appearance (i.e., strengths noted on laboratory reports as medium, strong, or very strong).

In more than 95% of the diamonds that exhibit fluorescence, the visible color is blue. As blue is the complementary color to yellow, the most common tinted color in diamonds, blue fluorescence can make yellowish diamonds look white or colorless. In rare instances, the reaction to fluorescence is yellow, white or another color.

What impact does fluorescence have on the appearance of a diamond?
GIA studies show that for the overwhelming majority of diamonds, the strength of fluorescence has no widely noticeable effect on appearance. In the GIA Fluorescence Study, it was found that the average person could not make a distinction between a diamond with fluorescence and a diamond without.
In many instances, observers prefer the appearance of diamonds that have medium to strong fluorescence. In rare cases, some diamonds with extremely strong fluorescence may appear hazy or oily; less than 0.2% of the fluorescent diamonds submitted to GIA exhibit this effect

Does fluorescence compromise the structural integrity of the diamond?
No. A diamond that fluoresces has the same integrity as one with no reaction to UV. Submicroscopic substitutions and/or shifts in the diamond structure can cause fluorescence or can prevent it. Nothing in either instance inherently weakens or is bad for the diamond.

Should I buy a diamond that exhibits fluorescence?
The preference to buy a diamond that exhibits fluorescence is a personal one, as a diamond’s appearance must be taken as a whole. Other factors can influence color appearance more strongly than fluorescence, such as how the diamond has been cut, whether the diamond is viewed in natural or artificial light, and even what you’re wearing on any given day.

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I should also add to this article that Fluorescence does effect the price of a diamond. So, when comparing prices, ensure you’re comparing apples to apples. I invite you to visit our showroom and view our large selection of loose diamonds. Randy and I are always happy to share our diamond knowledge and educate our clients.

Thank you and Have a Peaceful Day!

Michele L. Moss

A new website and blog

By | Diamonds | No Comments

So here I go, the start of Randor Jewellery’s New Blog. For the most part I will be selecting and writing about jewellery related topics. I being, Michele Moss G.I.A. Diamonds Graduate, Wife of Randy Moss, not the NFL Randy Moss, but the G.I.A. Graduate Gemmologist. Together we are Randor Jewellery.

We are also Mother and Father of four, yes I said four grown adults, one of which has not left home yet, and two who still have their own bedrooms for when they come home until there next adventure, one who is married and feeling the pressure from me to start providing grand kids. Oh and I cannot forget to tell you about Brunello, our one year old Italian Greyhound, who works as security for Randor, but he’s more like the official Randor greeter.

Please feel free to email me michele@restore.randor.com with any topics you wish to learn about. I will try to answer as quickly as possible. If I am not familiar with the topic then I can always ask Randy. He says he knows everything.

Our first topic is Diamond Fluorescence. Head over and learn about what this diamond characteristic that is not part of the traditional 4C’s of diamond quality is all about.

Thank you and Have a Peaceful Day!
Michele L. Moss

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