The fluorescence of a diamond is a phenomenon in which a diamond is exposed to ultraviolet light and emits visible light. This is the nature of most diamonds. The more common diamond fluorescence is blue, and there are differences between strong and weak.
Many consumers talk about the color of diamonds when they talk about the fluorescence of diamonds. They think that only diamonds without fluorescence are good diamonds. In fact, diamond fluorescence only affects the appearance of diamonds in a few cases. The Gemological Institute of America, the famous GIA laboratory, has made 11 clarifications for diamond fluorescence. Let's take a look.
Misunderstanding 1: All diamonds will fluoresce
Truth: Most diamonds don't fluoresce. After investigating more than 26,000 diamonds submitted to GIA for grading, the researchers found that only about 25% to 35% of diamonds exhibited a certain degree of diamond fluorescence when tested under standard long-wave UV lamps. Therefore, the diamond you are looking at may not fluoresce.
Myth 2: Diamond fluorescence can be seen under any lighting conditions
Truth: Fluorescent diamonds only fluoresce when exposed to invisible ultraviolet light or other energetic sources such as X-rays and lasers. You may see diamonds fluorescing in bright sunlight, on sunbeds, in dance halls, or in other places where intense fluorescent or black light is used. But once away from these sources, the diamond stops emitting fluorescence. Incandescent lamps do not fluoresce diamonds.
Misunderstanding 3: Diamond fluorescence is always detectable
Truth: Diamond fluorescence is sometimes undetectable. It can only be detected under conditions of ultraviolet (UV) irradiation and sufficient fluorescence intensity. Reputable accreditation bodies like GIA will strictly follow the rules to detect fluorescence. The strength is described in accordance with established standards to ensure the objectivity and consistency of the identification report.
Misunderstanding 4: Diamond fluorescence affects the color grade of diamonds
Truth: When assessing the color grade of a diamond, GIA checks the diamond in a strictly controlled viewing environment to minimize the effects of fluorescence and to make an accurate objective assessment of the diamond color. However, the intensity of the diamond's fluorescing may have an effect on the color grade of the diamond – a positive effect. In GIA's D to Z color grades, in lower grade (eg, I to N) yellow diamonds, moderately strong blue fluorescence may offset a portion of the yellow color, giving the diamond a color appearance that corresponds to the color grade system. Diamonds look better. See Misunderstanding 7.
Misunderstanding 5: Similar to color, clarity, diamond fluorescence can also be graded
Truth: Diamond Fluorescence is not one of the 4C standards (color, clarity, cut and carat weight) used to describe diamond quality. GIA sees fluorescence as an identifying feature and additional information that helps distinguish between different diamonds. The GIA Diamond Identification Certificate describes fluorescence intensity as none, weak, medium, strong, and strong. If the fluorescence intensity is medium, strong or strong, the color of the fluorescence will be indicated in the certificate of identification.
Myth 6: Diamonds only show blue fluorescence
Truth: Diamonds can display a variety of colors of fluorescence. Includes orange, yellow, orange, red, white, and green. The difference in atomic structure, such as the different numbers of nitrogen atoms, can cause this phenomenon. But by far, blue is the most common diamond fluorescent color.
Misunderstanding 7: Intense blue diamond fluorescence is not good
Truth: GIA studied the effect of blue fluorescence on the appearance of diamond under normal viewing conditions. The Institute found that ordinary observers (meaning jewelry purchasers) could not consistently distinguish any fluorescence-related effects in an observational environment most similar to the jewelry buying and wearing environment. However, GIA also found that intense blue diamond fluorescence may be beneficial. The results of the study show that, as explained in Misunderstanding 4, the appearance of some diamonds exhibiting intense blue fluorescence is more aesthetically pleasing than the reference color shown in the color grading system, while the countertop is facing upwards. There is no such obvious trend.
Misunderstanding 8: Diamond fluorescence can damage the flicker and beauty of diamonds
Truth: The effect of diamond fluorescence on diamond flicker is minimal or even unaffected, and studies have shown that it does not affect the aesthetics of diamonds. The flicker of a diamond depends mainly on the diamond cut, and it has nothing to do with whether the diamond has fluorescence. Diamond cuts – the angles and associated dimensions of the facets, as well as the other proportions, designs and craftsmanship of the diamond – determine how light shines and the degree of flicker.
Myth 9: A fluorescent diamond is a "real" natural diamond?
Synthetic diamonds made by chemical vapor deposition may exhibit intense pink-orange fluorescence (as well as other colors) when exposed to high-intensity ultra-short wavelengths, with some areas being slightly dark blue or violet.
The truth: obviously not the case. When you test your own diamonds, there is no fluorescence and it cannot be used to judge whether the diamond is true. First, not all natural diamonds fluoresce under standard UV light used by gemologists (see Misunderstanding 1). Second, some synthetic or synthetic diamonds also fluoresce at these wavelengths. Although the fluorescence of natural and synthetic diamonds differs in strength, color, and pattern, the same is true. Finally, materials such as synthetic zirconia, which is used to imitate diamonds, also fluoresce.
Misunderstanding 10: Fluorescence is detrimental to the durability of diamonds
Truth: Diamonds that fluoresce under standard UV light have no difference in structural integrity from diamonds without fluorescence. The submicroscopic structure that causes fluorescence does not inherently impair the durability of the diamond.
Myth 11: Is there a fluorescent diamond that is cheap?
Truth: Jewelry professionals do not believe that fluorescence will increase or decrease the value of diamonds. Some industry professionals believe that among the very rare high-end diamonds in the D to Z diamond color grading system, diamonds with extremely strong blue fluorescence are worth less than similar diamonds without fluorescence, because fluorescence makes them look blurry. Or turbidity, affecting the transparency of the diamond.
Conversely, some diamond traders give higher prices for blue fluorescent diamonds of lower color. As mentioned above, they believe that fluorescence masks the very light yellow of these diamonds. Diamond fluorescence and its impact on value is not a simple question, nor a simple answer. We recommend comparing diamonds in different lighting conditions and choosing your favorite diamond. After all, GIA believes that the beauty of diamonds is benevolent and wise.
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