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Diamond 4C Diamond Fluorescence Fluorescence
Learn about the mysterious glow of diamonds under ultraviolet (UV) light and its effect on value and appearance.
1. What is Diamond Glow?
Fluorescence is a natural characteristic of some diamonds. When exposed toUltraviolet light (e.g. sunlight or bill checking lamps)When illuminated, diamonds emit a temporary visible glow. When irradiation is stopped, the light disappears. Globally, there are approximately25%-35%The diamonds are fluorescent.
Under normal light
The fluorescent response is not visible.
Under ultraviolet (UV) light irradiation
Diamonds emit light (most commonly blue).
2. GIA Fluorescent Grade
GIA categorizes the intensity of the fluorescent response into five grades. This is clearly indicated on the GIA certificate.
None
No fluorescent light
Faint
low fluorescent light
Medium
Moderate fluorescence
Strong
Strong Fluorescent
Very Strong
Very strong fluorescent light.
3. The effect of fluorescent light on diamonds
Fluorescence is a "double-edged sword", and its impact on the appearance and price of diamonds depends mainly on the amount of fluorescence.intensityAs with the diamond itself, theColor Grade.
Positive impact (bonus effect)
For lower color grades (e.g. GIA grade) I to MThe Diamond.Medium Blue FluorescentNeutralizes the light yellow color of diamonds and makes them look good in the sunlight.Whiter and brighterThe price of the product is very high, and sometimes it enhances the appearance of the product at a more favorable price point.
Negative impact (demerit effect)
For very high color grades (e.g. GIA grade) D to Fcolorless diamonds.Strong or very strong fluorescent lightthere areVery low chance(less than 0.2%) will make the diamond appear to have aOily or hazy (oily/hazy), affecting its clarity and thus significantly reducing its value.
4. Summary of Purchase Highlights
General Market Preference
The more fluorescent a diamond is, the lower its value is in the general market. Diamonds with no fluorescence (None) are usually the most expensive.
High color with no fluorescence
If you are purchasing a D-H grade diamond, it is recommended that you select the"None" or "weak"Fluorescence to ensure the clarity and preservation of diamonds.
Low color with medium fluorescence
If you are considering an I-M grade diamond."Medium" Blue FluorescentMight be a high price/performance ratio option that has a chance of making the diamond look whiter.
Avoid strong fluorescent light
Unless you have seen it in action and confirmed that it is not oil-foggy, it is generally recommended to avoid buying it."strong" or "very strong"Fluorescent diamonds, especially when purchased online.
