By Daniel Carter, gemologist · June 19, 2026
No, lab-grown diamonds do not get cloudy over time. A lab-grown diamond is crystallized carbon with the same physical, chemical, and optical properties as a mined diamond, so it won't fog up, yellow, or lose its fire as the years pass. If a lab-grown diamond looks cloudy, one of two things is happening: a film of skin oil and soap residue has built up on the surface (cleans off in minutes), or the stone was a little hazy from the day it was cut. That second possibility is the part almost no one talks about, and it's the real reason people keep asking this question. So let me be straight with you, because most articles aren't: your diamond won't go cloudy, but some lab-grown diamonds do arrive cloudy. Below I'll show you exactly what causes it and how to read a grading report so you never buy one.
Then why do some lab-grown diamonds look hazy or milky from day one?
Here's the honest version. Walk through a hundred lab-grown diamonds and most are crisp and bright. A handful, though, have a faint milkiness, a kind of oily or sleepy look that doesn't sparkle the way the others do. That isn't aging. That's a quality trait baked into the stone during growth or cutting, and it was there before it ever reached your finger.
I think the industry does buyers a disservice by repeating "lab diamonds never get cloudy" and stopping there. It's technically true and practically misleading. People aren't imagining the hazy stones they see in marketplace listings and buyer forums. They're real. The good news? Every cause is identifiable on paper, so you have full control if you know where to look. The buyers who end up disappointed almost always have one thing in common: they bought without ever seeing a grading report or a video of the actual stone.
What actually causes a cloudy lab-grown diamond?
There are four real culprits, and only one of them is the "just clean it" answer everyone repeats. Here's how they break down.
| Cause | What it looks like | On the IGI/GIA report? | How to avoid it |
|---|---|---|---|
| Strong fluorescence | Milky or oily glow in direct sunlight | Yes, "Fluorescence" line | Choose None to Faint |
| Cloud inclusions | Soft, hazy patch inside the stone | Yes, listed as "Cloud" | Avoid stones where Cloud is the grade-setting note |
| Poor cut | Dull, glassy, low sparkle | Yes, "Cut" grade | Choose Excellent or Ideal |
| Dirt and oil | Gradual dullness over weeks | No, it's on the surface | Clean it (see below) |
A quick word on growth method, since it comes up. Most lab diamonds are grown by CVD or HPHT. The "milky CVD" reputation comes from early material years ago; today's CVD stones are routinely treated and graded to the same standard. So don't fixate on the method. Fixate on the report, which captures the traits that actually matter regardless of how the stone was grown. The folks at IGI and GIA grade lab-grown diamonds on the same 4Cs framework as mined ones.
How do you read an IGI or GIA report to avoid a hazy stone?
This is the part competitors skip, and it's the only part that protects your money. A grading report is not decoration. It's a screening tool. Here's the exact order I check things in when a client sends me a stone to vet.
1. Cut grade first, always. Carat gets the bragging rights, but cut controls whether a diamond looks alive or flat. For round brilliants, insist on Excellent or Ideal. (Round brilliants get pushed hard partly because they're easy to sell, but they do return light beautifully when cut well.) For fancy shapes, ask for a video, since cut isn't always graded the same way. See how GIA explains cut if you want the full breakdown.
2. Fluorescence next. Find the Fluorescence line. None, Faint, or Medium are all fine. Strong and Very Strong are where a small share of stones pick up that milky look outdoors. It's a one-word check that saves a lot of regret.
3. Read the clarity characteristics, not just the grade. A VS1 sounds great, but two VS1 stones aren't equal. Look at the plotted inclusions and the key to symbols. If you see the word Cloud doing the heavy lifting, especially a large or centered one, that's the trait most likely to read as haze. A few scattered pinpoints are nothing. A dense cloud is everything. GIA's clarity guide covers what each symbol means.
4. Demand a video of the actual stone. Not a stock image. The real one, spinning, in normal light. Any seller worth buying from has this. If they won't show you the stone on the report number you were given, walk away.
Do those four checks and the odds of a hazy surprise drop to almost nothing. That's the whole framework. It costs you five minutes and zero dollars.
When cloudiness really is just dirt, and how to clean it safely
Most "my diamond looks cloudy" panics are simply buildup. Hand cream, sunscreen, dish soap film, and the natural oils from your skin coat the stone and kill the sparkle. It happens to mined diamonds too. The fix takes five minutes.
- Soak the ring 10 to 15 minutes in warm water with a few drops of mild dish soap.
- Gently brush the stone, including underneath the setting where grime hides, with a soft toothbrush.
- Rinse under warm running water (do it over a mesh strainer so nothing slips down the drain).
- Pat dry with a lint-free cloth and check it in good light.
- Get a professional clean and setting check once or twice a year.
Skip the harsh chemicals, and take the ring off before lotions, swimming, or heavy work. That's genuinely all the maintenance a lab-grown diamond needs to stay brilliant for decades.
Round brilliants return the most light per stone, so a well-cut row like this stays bright for life.
Do moissanite stones get cloudy too?
No, moissanite doesn't get cloudy either, and I get this question constantly. Moissanite is a tough, stable gem that scores 9.25 on the Mohs hardness scale, just under a diamond's 10. It doesn't fog, fade, or lose fire over time. Like any stone, it dulls when oils and residue coat it, and like any stone, a soft brush and warm soapy water bring it right back.
The one difference worth knowing is optical, not durability. Moissanite throws more colored fire than a diamond, that flashy rainbow effect. Some people love it. Some read the extra fire as looking slightly different from a diamond. Neither is cloudiness. If you want both options in one design so you can decide by eye, this piece offers either stone.
Choose moissanite or a lab-grown diamond in the same elongated oval setting, and the oval reads larger per carat.
How to buy a lab-grown diamond that stays brilliant for life
Put it all together and the buying rule is simple. Lab-grown diamonds are real diamonds, often 30 to 50 percent cheaper than mined stones of the same look, and they will not cloud over with age. Your only job is to screen out the rare hazy one before you pay. Insist on an IGI or GIA report. Check cut, then fluorescence, then the clarity plot for a dominant Cloud. Watch a video of the actual stone. Then care for it with nothing fancier than soap and water.
Lab-grown is now the mainstream choice, not the budget compromise it used to be: The Knot's 2026 Real Weddings Study reports that most US couples now choose a lab-grown center stone. Buy on the report, not the hype, and the clarity you see on day one is the clarity you keep. For a deeper care routine, Brilliant Earth and Rosec Jewels both cover the cleaning basics well.
Emerald cuts have large open tables, so clarity shows. A clean, well-graded stone here looks crisp, never sleepy.
Frequently asked questions
Do lab-grown diamonds get cloudy over time?
No, lab-grown diamonds do not get cloudy over time. They're crystallized carbon with the same structure as mined diamonds, so they don't fog, yellow, or degrade. Any cloudiness is either surface dirt or a quality issue the stone had from the start.
Why does my lab-grown diamond look cloudy or foggy?
Most of the time it's a film of skin oil, lotion, or soap residue that a quick clean removes. If cleaning doesn't fix it, the haze was built into the stone through strong fluorescence, clusters of pinpoint inclusions, or a poor cut.
Can a cloudy lab-grown diamond be cleaned or fixed?
Surface cloudiness cleans off in minutes with warm water, mild dish soap, and a soft brush. Internal haziness from inclusions or fluorescence cannot be cleaned away because it's part of the stone itself, which is why you screen for it before buying.
Does diamond fluorescence make a lab-grown diamond look hazy in sunlight?
Strong or very strong fluorescence can give a small percentage of diamonds a milky or oily look in direct sunlight. It's listed on the grading report, so you can avoid it by choosing a stone graded None to Faint.
How can I tell if a lab-grown diamond will stay clear before I buy it?
Read the IGI or GIA report before you pay. Choose a cut grade of Excellent or Ideal, fluorescence of None to Faint, and check the clarity notes for a dominant Cloud. Then ask for a real video of the actual stone.
What clarity and cut should I choose to avoid a cloudy lab-grown diamond?
Aim for a cut grade of Excellent or Ideal and a clarity of VS1 or higher, then confirm the plotted clarity notes aren't dominated by a large Cloud. That combination gives you a bright, transparent stone without overpaying for a flawless grade you can't even see with the naked eye.
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