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So, just what is diamond fluorescence? Fluorescence refers to the soft blue glow that a diamond emits when exposed to ultraviolet light, such as a black light. This blue glow is only temporary and stops once the ultraviolet light is gone. While blue fluorescence is the most common, on rare occasions the soft glow can be yellow, green, red, orange and white.
Fluorescence is caused by trace elements in the diamond and, according to the Gemological Institute of America, about 25% to 30% of diamonds exhibit a degree of fluorescence. Of all of the diamonds that possess fluorescence, the GIA states that only about 10% of these stones have fluorescence can affect the diamond’s appearance. In most cases, people are not able to detect fluorescence with the naked eye.
Now that you know what diamond fluorescence is, let’s cover the degrees of fluorescence. The GIA has detailed five degrees of diamond fluorescence:
Remember, the GIA stated that only 10% of all diamonds that exhibit fluorescence will be visibly affected in non-UV settings. Therefore, of that 10% only a small amount of diamonds (those with a high degree of fluorescence) will be visibly affected by fluorescence.
The main way that fluorescence affects a diamond is by creating a cloudy, milky appearance and affecting the diamond’s value. The cloudy appearance is only noticeable in medium to very strong fluorescence. But how does fluorescence affect value?
To understand how fluorescence affects a diamond’s value, we need to understand diamond color grades. Color is one of the 4 C’s of diamond grading and details the amount of color, or lack thereof, that a diamond displays. This is graded on a scale from D, for colorless, to Z, for faint yellow. Strong blue fluorescence creates the appearance of a whiter stone than it’s color grade. This happens because blue is a complement color to yellow, creating the whiter appearance.
How fluorescence affects diamond value:
If you have a certificate from a reputable diamond grading lab such as the GIA, you can reference this document to find your diamond’s exact fluorescence. If you have a jeweler’s appraisal for your diamond that includes fluorescence, take their grading with a grain of salt.
In reputable labs, expert gemologists assess a diamond’s fluorescence in a highly controlled environment with UV spectrum lights and a master set of fluorescent diamonds to best determine a diamond’s grade. Reports from jewelers can be subjective as they depend on the specific jeweler’s skill, environment and tools.
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To begin selling your diamonds, designer jewelry and luxury watches with WP Diamonds, all you need to do is complete our simple online form with information about your pieces. Our team will then get back to you with a price quote. If you like your initial quote and want to get a firm buying offer, you can either schedule an appointment at one of our offices or request a free, secure, fully insured and overnight shipping label to our New York, UK or Hong Kong offices. Once our experts assess your pieces in person, we will contact you with a firm price.
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