Luminous Diamonds, Who Are They?
Key Takeaways
- Kim cương phát quang None is the term for diamonds that do not emit any light (usually blue) when exposed to ultraviolet (UV) light. According to GIA standards, this is the highest...
Kim cương phát quang None is the term for diamonds that do not emit any light (usually blue) when exposed to ultraviolet (UV) light. According to GIA standards, this is the highest fluorescence grade, ensuring the diamond retains its natural transparency without becoming milky or changing color under sunlight.
This article will explain in detail the fluorescence grades and their impact on the global diamond price list.
What is a None fluorescence diamond?
None fluorescence diamond is a state where a diamond has no fluorescent reaction, meaning it retains its original color even under the influence of ultraviolet rays. In a standard grading environment, when a specialized UV light is shone, a "None" grade stone will not show any blue light or any other scattered color.
According to research from the Gemological Institute of America (GIA), although approximately 25% to 35% of natural diamonds exhibit fluorescence, the "None" grade is still considered the gold standard because:
- Absolute clarity: Ensures no light barriers reduce the diamond's "fire".
- Stability: The diamond's color does not change under different environmental lighting conditions.
- Prestigious certification: Always appears on GIA certificates for the highest-grade diamonds.
None fluorescence diamond is a state where a diamond has no fluorescent reaction
Fluorescence in diamonds
Diamond fluorescence is a unique identification factor, reflecting the light interaction tendency of each stone. GIA experts classify fluorescence into 5 grades based on the intensity of luminescence:
- None: The perfect grade for high-color diamonds.
- Faint: Very weak luminescence, almost no impact on beauty.
- Medium: Light is more noticeable under UV light.
- Strong: Brilliant blue light under ultraviolet rays.
- Very Strong: Can make the diamond appear as if covered by a milky haze.
According to GIA research, fluorescence does not affect the structural integrity of a diamond, but it directly impacts the visual effect (clarity) and commercial value of the stone.
Diamond fluorescence is a factor reflecting the light interaction tendency of each stone
See more: Where to buy 2 billion VND diamond rings?
Impact of fluorescence on diamond value and beauty
The intensity of luminescence directly affects the visual effect and commercial value, especially the price difference between white diamonds and yellow-tinted diamonds.
Actual data from GIA indicates that among diamonds with fluorescence, less than 10% have an intensity strong enough for the naked eye to perceive a change. In particular, only about 0.2% of stones are negatively affected (milky appearance). However, market psychology remains strictly evaluative based on this parameter:
1. For high-color diamonds (D-E-F)
In this group, None fluorescence is mandatory to maintain value. If a D-color diamond has Strong fluorescence, its value can decrease by 5% - 15% due to the risk of "Milky" appearance (cloudy like milk), causing the stone to lose its natural sparkle.
2. For low-color diamonds (I-J-K)
Conversely, blue fluorescence can sometimes be beneficial for this group. The blue hue tends to neutralize the faint yellow tint, making the stone appear "whiter" than its actual color grade. In this case, the price can increase slightly by about 2%.
Impact of fluorescence on diamond value and beauty
How much does a None fluorescence diamond cost?
None fluorescence diamonds cost from over 100 million VND to over 300 million VND depending on the diamond 4Cs standards. In the diamond market, stones with Fluorescence: None always have the highest value due to their absolute transparency and stable liquidity. Below are the latest updated prices for popular sizes:
| Color (Color) | Clarity (Clarity) | Reference Price (VND) |
| D | IF (Flawless) | 280,000,000 - 320,000,000 |
| D | VVS1 | 230,000,000 - 255,000,000 |
| E | VVS2 | 190,000,000 - 215,000,000 |
| F | VS1 | 165,000,000 - 185,000,000 |
| G | VS2 | 140,000,000 - 155,000,000 |
| H | VS2 | 115,000,000 - 130,000,000 |
Note: The diamond prices in the article are updated on 20/04/2026. In case of scarce supply, diamond prices may increase sharply in the future.
See more: How much do 3.6mm diamond rings cost?
The value of a perfect diamond will always be the highest. This is when the gemstone has a color grade from D to J and None fluorescence. Impeccable beauty is what we get in this diamond classification.
Above are the answers to what is a None fluorescence diamond? The value of None fluorescence depends on the color and clarity of the diamond. If you want specific information, please contact and receive consultation from Jemmia Diamond via hotline 0838 353 333.
