Reviewed by Yoona's in-house jewelry experts
Short answer: no, lab-grown diamonds don't get cloudy over time. They're chemically and structurally identical to mined diamonds, so they keep the same hardness and stability for life. If a diamond looks dull, it's almost always buildup on the surface, not the diamond itself.
Why Lab-Grown Diamonds Don't Cloud Over Time
Quick answer: Lab-grown diamonds share the same 10/10 Mohs hardness and crystal structure as mined diamonds, which means the same long-term clarity and stability, cloudiness isn't a property of the diamond itself.
A diamond's clarity is set at the point it's cut and polished, and nothing about daily wear changes that internal structure. If your diamond looks less brilliant than it used to, the diamond hasn't changed, something has accumulated on its surface.
What Actually Causes That Dull, Hazy Look
Quick answer: Lotion, hair products, natural skin oils, and soap or hard water residue are the most common causes of a diamond looking dull, all of which are removable with a simple at-home cleaning.
- Dirt and oil buildup: Lotion, hair products, and natural skin oils coat the diamond's surface, creating a hazy look that's completely reversible.
- Soap and hard water residue: Washing dishes or showering with a ring on can leave a film, and hard water minerals build up over time if left uncleaned.
A simple at-home cleaning, warm water, mild dish soap, and a soft brush, restores brilliance in most cases within minutes.
Does Moissanite Cloud the Same Way CZ Does?
Quick answer: No. Moissanite, at 9.25 on the Mohs hardness scale, resists clouding and scratching very well under normal wear. Cubic zirconia, a much softer material at around 8 to 8.5 Mohs, is the one that's genuinely prone to dulling over years of wear.
This is worth correcting directly since the two get lumped together often: moissanite is close enough to diamond hardness that it doesn't share cubic zirconia's long-term clouding problem. If a stone dulls permanently with age rather than from surface buildup, that's a CZ characteristic specifically, not something moissanite or lab-grown diamonds experience.
Can Color Treatment Fade Over Time?
Quick answer: No. Color treatment applied to some HPHT diamonds is a permanent structural change, not a coating, so it doesn't fade, wear off, or need to be reapplied.
This is worth distinguishing clearly from surface buildup: color treatment alters the diamond at a structural level during processing, it isn't a surface layer that can wear away with time or cleaning. A treated diamond's color grade is permanent and stable for the life of the stone, exactly like an untreated one.
How to Keep Any Diamond Looking Its Best
Quick answer: Clean daily-wear pieces every 1 to 2 weeks, remove jewelry before applying lotion or cooking, and schedule a professional cleaning and inspection every six months.
For the full at-home cleaning routine and storage guidance, see How to Clean, Store & Protect Your Jewelry at Home.
Frequently Asked Questions
Can a dull-looking diamond be permanently damaged?
Almost never from normal wear. Surface buildup causing a dull look is reversible with cleaning, permanent cloudiness in a diamond itself is extremely rare barring physical damage.
Does cloudiness mean my diamond is fake?
No, a real diamond, lab-grown or mined, can look temporarily dull from buildup just like any other. That's a cleaning issue, not an authenticity one.
How quickly does buildup happen?
It varies by lifestyle and how often the piece is worn, daily-wear rings typically benefit from cleaning every 1 to 2 weeks to stay ahead of it.
Yoona's Standard
Every Yoona diamond, lab-grown and IGI certified, is built for lasting clarity. If yours ever looks dull, it's almost certainly ready for a quick clean, not a cause for concern about the stone itself.
