Fake diamonds, on the other hand, will glow other colors or not at all. While an extremely high quality gem will also not glow under UV light, this can be a good test for questionable stones if done in consultation with a trained jeweler.
The short answer is no, lab-grown diamonds do not glow in the dark. The reason for this is that diamonds, whether they are natural or lab-grown, are made up of carbon atoms that are arranged in a specific crystal structure known as a diamond lattice.
Diamonds that belong to a group called type IIB usually look blue. After they absorb high-energy light like UV light however, type IIB diamonds glow in the dark for a short time. This afterglow refers to the phosphorescence of a diamond which ranges in colour from blue to pink and fiery red, depending on the diamond.
According to the GIA diamond report, more than 65% of diamonds lack fluorescence. Only 30-35 % of diamonds have fluorescence whose glow depends on the strength or intensity of the reaction between their diamond fluorescence and black light.
Sometimes, tiny amounts of impurities in diamonds can cause them to glow or luminesce under UV light. UV diamond fluorescence occurs in about 35% of colorless (white) diamonds and can be faint or very strong. (Fluorescence is a type of glow that occurs almost immediately after exposure to UV light).
Only about 25% to 35% of diamonds exhibit some degree of fluorescence in reaction to long-wave UV light. More than 95% of these diamonds fluoresce blue. A rare few fluoresce other colors such as yellow or green.
A fake diamond, on the other hand, will almost never look blue under a black or UV light. This is not the most reliable test for those who would like to know the true status of their diamond.
Patients typically enjoy their DiamondGlow results for an average of 4 – 6 weeks before a repeat treatment may be needed. In addition, we strongly recommend using SkinMedica products at home after your DiamondGlow treatment to maintain your healthy, glowing complexion between your in-office procedures.
Fake diamonds like cubic zirconia do not glow under black light!
By holding a diamond close to a source of light, such as a flashlight, you can tell whether or not it's real. Watch closely for the shimmers of light that shine from the stone. A real diamond will reflect light easily, and provide you with a disco ball or rainbow-like display.
In cut stones, cubic zirconia tends to have dull, rounded edges, while diamonds' facets stay sharp. Diamonds rarely show polish marks, but if they do, they will be in different directions on different facets. On the other hand, cubic zirconia will show polishing marks in the same direction on adjoining facets.
A real diamond appears gray and white inside (brilliance) when held to the light and can reflect rainbow colors (fire) onto other surfaces. A fake diamond will display rainbow colors within the stone when held up to light.
Hold it in the light to see how it sparkles.
A fake diamond will have rainbow colors that you can see inside the diamond. “People have a misconception that diamonds sparkle like a rainbow, but they don't,” Hirsch said. “They do sparkle, but it's more of a gray color.
During Your Diamond Glow Facial
During your facial, you can expect to feel a gentle suctioning sensation as the diamond-tipped head moves across your skin. The suction sensation is completely normal and should not cause you any discomfort. Many people find the experience to be quite relaxing!
How often should you get DiamondGlow™ treatment? For optimal results, you should get anywhere between 3 and 6 DiamondGlow™ treatments depending on your skin and desired results. While you can space these sessions 7 to 10 days apart for faster results, we recommend waiting at least 2 weeks between treatments.
Skin that looks brighter, fresher, healthier, smoother, and clearer. Post-treatment, you can expect a more even-toned complexion and fewer clogged pores. Actual DiamondGlow® patient. Results may vary.
If you have a loose diamond to test, fill a regular glass about ¾ of the way full with water. Gently drop the diamond into the glass. If the diamond sinks to the bottom, it's real. If it floats at the surface or just underneath, it's likely a fake.
It is important to note that not all diamonds with fluorescence will glow under UV light. The intensity of fluorescence can vary from diamond to diamond. Diamonds with faint fluorescence may not glow at all, while diamonds with strong or very strong fluorescence may glow very brightly.
For example, your diamond may have inclusions clustered together in the same area, making the stone appear milky or foggy. Diamond fluorescence may also be the culprit. Some diamonds may have strong fluorescence that can give off a milky hue and reduce the value of the diamond.
Fluorescence: Sapphires of any color can fluoresce under long wave UV light if iron content is low enough that it doesn't quench fluorescence. Fluorescence colors include pink and red (due to chromium) and orange (due to F-centers or crystal lattice defects according to Vigier & Fritsch, 2023).
Cubic Zirconia (CZ) often shows orange fluorescence but in REVERSE ORDER. This reversal is a sure test for diamond versus CZ. vs.
Most synthetic diamonds look too good to be true all due to their extreme brilliance. Does your stone look really bright with lots of rainbow reflected colors? If so, it's most likely cubic zirconia. Yes, real diamonds are brilliant, but they are much more subtle than synthetics.
No, cubic zirconia does not shine with the same brilliance as a diamond. Diamonds shine with pure white light, while CZ diamonds give off rainbow colors. They are also more prone to becoming dull and scratched over time, and are thus not the best option for daily wear.