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Which Diamond Inclusions Are the Worst?
At Da Vinci Jewelry Design, we’re very honest about something most jewelers gloss over: almost every diamond has inclusions tiny internal “birthmarks” formed under extreme heat and pressure. That’s normal. The real question isn’t “Does it have inclusions?” but “Do these inclusions hurt how it looks or how long it lasts?”
Quick Take: Not All Inclusions Are Equal
When we evaluate inclusions at Da Vinci we look at five things (this is the same framework used by top labs like GIA): size, number, location, nature (type), and color/contrast of the inclusion.
The “worst” inclusions are usually ones that:
Jump out to the naked eye (especially smack in the center of the stone)
Interrupt light performance (make the diamond look dull, dirty, or peppered)
Compromise durability (create weak points that can chip or crack)
From both lab guidelines and expert education sources, the most problematic inclusion situations are: black carbon spots, very visible “center-stage” inclusions, serious cracks/fractures, and chips on the surface.
What Are Diamond Inclusions, Really?
Inclusions are natural or growth-related features inside the diamond—tiny crystals, feathers (micro-fractures), clouds, etc. They’re why your diamond is unique, like a fingerprint. Most are only visible under 10x magnification and never bother you in real life.
The Worst Offenders (And Why We Flag Them)
Black Carbon Spots (Especially Under the Table)
These are dark, pepper-like dots inside the diamond that can look like specks of dirt you can’t wipe away. They’re sometimes called black crystals or black carbon spots.
Why they’re “worst”:
- Visually loud: Dark inclusions have high contrast against a bright, white, sparkling diamond—your eye goes straight to them.
- Can block light: A cluster of dark crystals can interfere with the way light bounces through the diamond, reducing fire and brilliance.
- Hard to ignore if central: One obvious black spot dead-center can be more distracting than several tiny white ones off to the side
Da Vinci buying rule:
We’re cautious with stones that have obvious dark crystals near the center of the table, especially in SI-range clarity. We’ll either reject them or use setting strategies to hide them if the rest of the stone is exceptional.
Center-Stage Inclusions (Dead Center Under the Table)
These are inclusions that sit right where everyone looks first: in the middle of the diamond’s top view (the table).
Why they’re “worst”:
Always in view: Even a modest-size inclusion becomes distracting if it’s right in the center.
Can affect sparkle: Central inclusions can interfere with how light travels through the diamond, making it look less lively.
Higher risk in larger stones: The bigger the carat weight, the easier it is to see central inclusions, even at higher clarity grades.
Da Vinci Buying Rule
If a central inclusion catches our eye in normal lighting at a conversational distance, we’ll pass or we’ll flag it for you explicitly so you’re knowingly trading specs vs. budget.
Cracks & Fractures (Serious Feathers)
“Feathers” are internal fractures that can look like wispy white lines or cracks. Not every feather is dangerous but large feathers, especially those that reach the surface or are near the girdle, are a red flag.
Why they’re “worst”:
Durability risk: A significant fracture can create a weak point, especially close to the girdle or running across the stone. A hard knock there can chip the diamond.
Visible in some lighting: Long, reflective feathers can show as whitish lines when the diamond is tilted.
Trouble for active wearers: If you’re hands-on (gym, manual work, active lifestyle), we’re extra conservative with feathers.
Chips on the Surface
A chip is a small missing fragment of diamond, usually along an edge, corner, or the girdle.
Why they’re “worst”:
Already damaged: A chip means the diamond has already been compromised once.
Future risk: The chipped area is more likely to chip again during setting, resizing, or daily wear.
Visible from up close: Many chips catch the light and look like a white “bite” out of the facet.
Inclusions That Might Be Fine (In the Right Place)
Some inclusions sound scary on paper but are often acceptable if they’re small and well-positioned:
Small white crystals off to the side – Often invisible without magnification.
Tiny pinpoints – Usually benign unless they cluster into a cloud.
Minor clouds – Fine if they don’t give the diamond a hazy, milky look face-up.
Feathers that are small, internal, and away from stress points – Many VS/SI stones have these.
How Da Vinci Evaluates Clarity for You
Because our core clients care about ethics, value, and design not just a lab grade we go beyond the letter on the report.
Our internal checklist when looking at inclusions:
Can I see it at arm’s length?
If yes and it’s central or dark → likely a pass.
Does it threaten durability?
Girdle feathers, chips, large fractures → extra scrutiny or decline.
Can the setting hide it safely?
Side-positioned inclusions can sometimes be tucked under a prong.
Is this the best value at this clarity grade?
We often recommend “smart clarity” (VS2–SI1 range) with clean appearance rather than “overpaying” for unnecessary FL/IF grades.
FAQ – Diamond Inclusions & What to Avoid
What types of diamond inclusions should I avoid the most?
Focus on avoiding obvious black carbon spots, big inclusions in the center, serious cracks/fractures, and surface chips these are the ones that most impact beauty and/or durability.
Why are black carbon spots such a big deal?
Because they’re dark, they stand out against a bright, white diamond and can interrupt light performance especially if they’re under the table or appear as a cluster. Even in a lower clarity stone, we try to keep dark crystals off-center or hidden in the facets or under the setting.
Is an inclusion in the center always worse than one on the side?
In most cases, yes. A central inclusion is easier to see and more likely to catch your eye every time you look at the ring. Side inclusions can sometimes be hidden under prongs or lost in the facet pattern provided they’re not big durability risks.
Can inclusions make a diamond more likely to break?
Some can. Serious feathers, fractures near the girdle, large surface-reaching inclusions, and chips can create weak points where the diamond is more vulnerable to chipping or breaking under impact. That’s why our bench jeweler evaluates these carefully, especially for active wearers.
Do inclusions get worse over time?
Most minor inclusions stay exactly as they are. However, existing weak points (like certain fractures or chips) can be stressed by hard knocks or poor setting/repair work. Proper setting design, regular check-ups, and smart wear habits help keep your diamond safe
Are lab-grown diamonds better or worse for inclusions?
Lab-grown diamonds still have inclusions, but they’re formed in a controlled environment, so the inclusion “patterns” can differ from natural stones. What matters most is still the same: can you see it, does it affect sparkle, and does it threaten durability? We apply the same clarity standards to both.
Do I need a “Flawless” diamond to avoid bad inclusions?
No. Many of our favorite “smart value” diamonds live in the VS1–VS2 range and look beautifully clean in real life when carefully selected. The key is stone-by-stone evaluation, not blindly chasing a grade.
Can DVJD help me evaluate inclusions on a specific diamond?
Yes. As part of our Proof-First approach, we’ll walk you through the certificate, clarity plot, and magnified images, highlight any inclusions that matter, and show you how the diamond performs in standardized light—before you commit.
Still Worried About Inclusions?
Upload your report or link the stone you’re considering. A Da Vinci specialist will give you a no-pressure, 1:1 clarity review what’s fine, what’s risky, and what gives you the best sparkle for your budget.
