Diamond Inclusions: What Are They?

Know your diamond inclustions before you buy

Diamonds often have unique internal characteristics called inclusions — the natural birthmarks of a diamond.

Inclusions found inside a diamond are considered flaws, meaning the stone is not completely flawless. Some inclusions are purely identifying features, while others can affect the way light travels through the diamond, influencing its clarity and overall appearance.

Pinpoint Inclusions

Pinpoints are tiny crystals within a diamond that may appear light or dark. They can occur individually or in groups. When many pinpoints cluster together, they can create a cloudy or hazy area known as a cloud.

Feathers

Feathers are small internal fractures that resemble delicate feathers. Minor feathers usually do not impact a diamond’s durability unless they extend to the surface of the stone.

Fringes and Bearding

These are fine, hair-like lines found along the diamond’s girdle. Bearding can occur during the cutting process and appears as tiny fractures around the edge of the stone.

Grain and Growth Lines

Grain lines develop during the diamond’s natural formation process because of irregular crystal growth. White or dark grain lines can sometimes affect a diamond’s clarity grade.

Cleavage

Cleavage is a straight internal crack without the feathered appearance of a fracture. Because diamonds split naturally along certain crystal directions, significant cleavage can weaken the stone and potentially cause it to separate along its length.

Laser Lines

Unlike natural inclusions, laser lines are man-made. They are created during a treatment process in which a laser removes a dark inclusion from a diamond. The remaining vapor trail appears as a fine thread-like line that begins at the surface and extends inward to the area where the inclusion was removed.

Before purchasing a diamond, take the time to understand its inclusions. A diamond is a significant investment, and knowing its natural characteristics helps you make an informed decision. These unique “birthmarks” can also serve as identifying features if you ever need to verify or identify your diamond in the future.

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Diamonds

You should know the 4c’s.

The 4 C’s are the key criteria by which a diamond is graded: Color, Clarity, Cut, and Carat Weight. Together, they shape how rare, beautiful, and valuable a diamond truly is. Color affects how bright and white the stone appears. Clarity reveals how clean it is inside. Cut determines how brilliantly it sparkles, and carat weight influences its size and overall presence.

No single C of the 4C’s tells the whole story. An ideal diamond for you is about finding the right balance between these factors to match your taste, priorities, and budget. On this page, we’ll walk you through each of the 4 C’s in clear, simple terms and point you to other pages and posts with even more detail, so you can feel confident and informed as you begin your diamond-buying journey. Diamond Certification and why it’s important is another great page to look at. If you don’t know what inclusions are in your diamond, you can find the name and description of all diamond inclusions right here on our site at Diamond Inclusions: What Are They?

Diamond Certification: Why It’s Important?

Key Takeaways

Diamond certification acts as a report card, detailing carat weight, color, clarity, cut, and whether the stone is natural or lab-grown.
Certification protects against misrepresentation and ensures you get what you pay for, helping with resale and insurance.
Both natural and lab-grown diamonds require certification to confirm quality and authenticity.
If a diamond lacks certification, it’s a major red flag; don’t buy it to avoid scams and disappointment.
N.J. Diamonds provides certified diamonds and offers guidance to ensure customer confidence and trust.

Why Diamond Certification Matters (Yes, Even If You Think It Doesn’t)

Hey there! 👋 Whether you’re shopping for a diamond engagement ring, a sparkly pair of earrings, or just love the look of a lab-grown gem, you need to know one thing:

Summary: 5 Most Important Points on Diamond Certification

What is Diamond Certification?

Certification acts as a report card for diamonds, detailing their carat weight, color, clarity, cut, and whether they are natural or lab-grown, ensuring transparency in the purchase.
Protects Against Misrepresentation:
Without certification, diamonds can be mislabeled or even fake, leading to potential financial loss. Certification provides assurance that what you are buying matches the seller’s claims.
Clarifies Value:
A certified diamond comes with a detailed report, allowing you to compare different diamonds accurately and understand exactly what you are paying for.
Essential for Insurance and Resale:
Certified diamonds are necessary for insurance coverage in case of loss or theft and better retain their value if you decide to upgrade or sell later.
Lab-Grown Diamonds Need Certification Too:

Just like natural diamonds, lab-grown diamonds can vary in quality. Certification confirms the specifics, ensuring consumers know the quality of their purchase.

CERTIFICATION. MATTERS.

We’re N.J. Diamonds in Dearborn, Michigan—family-owned, locally trusted, and here for 30 years—and we’re about to break this down for you in plain, no-nonsense language. Because when it comes to diamonds, what you don’t know can cost you.

Wait—What Is Diamond Certification, Anyway?

Think of diamond certification like a report card for your diamond. Except instead of math and history grades, it lists things like:

Carat weight (how big it is)
Color (how white or yellow)
Clarity (how clean it looks inside)
Cut (how well it sparkles)
Whether it’s natural or lab-grown
Whether it’s been treated or enhanced

And it’s all documented by an independent gemological lab—like GIA, IGI, or GCAL.

It’s not just a piece of paper. It’s proof that the diamond you’re buying is exactly what the seller says it is.

So, Why Should You Care?

1. It Protects You from Getting Ripped Off

Without certification, a diamond could be mislabeled, overpriced, or even fake. You might be told you’re getting a 1-carat diamond, but it’s really 0.85. Or worse—you buy what you think is a natural diamond, but it turns out to be a treated or even synthetic stone.

Certification takes the guesswork out. No scams. No surprises.

2. It Tells You What You’re REALLY Paying For

Diamonds look very similar to the untrained eye. A certified diamond comes with a report that breaks down what makes it valuable.

This helps you compare apples to apples. A certified half-carat lab-grown diamond with excellent clarity and cut? Now you can confidently compare that to a natural diamond with similar stats.

3. It Helps with Insurance and Resale

No certification = no official record.

Let’s say your ring gets lost or stolen (heaven forbid). Insurance companies want a certified appraisal or lab report to cover the cost. If your diamond isn’t certified? You might be left with pennies instead of protection.

Thinking of upgrading or selling later? A certified diamond holds value and trust.

What About Lab-Grown Diamonds?

Great question. At N.J. Diamonds, we love both natural and lab-grown diamonds, and yes—lab-grown diamonds absolutely need certification too.

Why?

Because just like natural diamonds, lab-grown stones vary in quality. Certification confirms if it’s:

HPHT or CVD (two different growth methods)
Treated or untreated
Graded fairly (cut, clarity, etc.)

And yes—just because it’s lab-grown doesn’t mean it’s automatically high quality. Certification proves what you’re getting.

Bottom Line: If It Doesn’t Have Certification, Don’t Buy It

We mean that.

If someone’s trying to sell you a diamond—natural or lab-grown—without a certification, that’s a red flag 🚩. Big time.

Here at N.J. Diamonds, every certified diamond we sell comes with documentation you can trust—from reputable labs only. We’ll walk you through it, explain what it all means, and help you choose a stone that’s not just beautiful—but smart.

Ready to See for Yourself?

Come visit us in Dearborn, Michigan—same location for nearly 30 years. We’re family-owned, experienced, and happy to answer even your “dumbest” questions (trust us, they’re never dumb). 😉

Because at N.J. Diamonds, it’s not just about the sparkle—it’s about confidence, honesty, and value you can trust.

N.J. Diamonds
💎 Certified Natural & Lab-Grown Diamonds
📍 Dearborn, MI – Same spot since the ’90s
👨‍👩‍👧‍👦 Family-Owned. Customer-Focused. Always Honest.

Come in. Ask questions. Leave smarter.

Diamond Cut, Clarity, and Color Explained

Diamond Cut, Clarity, and Color, or better known as the 4 C’s

Key Takeaways

Understanding Diamond Cut, Clarity, and Color is essential to avoid being misled by jewelers.
Clarity grades range from Flawless to Included, impacting a diamond’s value and appearance.
Diamond Color ranges from colorless to various shades, including rare fancy colors that are more valuable.
Key diamond parts include the Crown, Pavilion, Girdle, and facets, which all influence sparkle and brilliance.
Some diamonds undergo treatments, like fracture filling and lasering, to enhance clarity, which may affect their value.

You might ask yourself Why do I need to know all of this? Well, the more you know when you go to buy a diamond, the less likely it is for some jewelry store to cheat you. You should have all the information you need to understand what you are investing money in. If you were to buy a car, you would go to every website you could to gather information on the car you might buy. Well buying a diamond is no different; you need to gather all the information you can before you set out on your diamond-buying venture.

Diamond Clarity

F -Flawless Free from all inclusions or blemishes.
IF- Internally Flawless No inclusions visible at 10x magnification
VVS1 -Very Very Slightly Included #1 inclusions that are extremely difficult to locate at 10x
VVS2- Very Very slightly Included #2 inclusions that are extremely difficult to locate at 10x
VS1 -Very slightly included #1 inclusions that are very difficult to locate at 10x
VS2 -very slightly included #2 minor inclusions that are somewhat difficult to locate at 10x
SI1 -Slightly included #1 Noticeable inclusions that are very easy to locate at 10x
SI2- Slightly included #2 noticeable inclusions that are easy to locate at 10x
I1- Included #1 obvious inclusions somewhat easy to locate with the unaided eye
I2 -Included #2 Obvious inclusions easy to locate with the unaided eye.
I3- Included #3 Obvious inclusions are very easy to locate with the unaided eye.

Diamond Color

Color:
Describes the amount of color the diamond has. This can range from colorless to yellow with slight tints of yellow, gray, or brown. Colors can also range from intense yellow to brown, blue, green, pink, and red. These fancy colors are rare and more valuable.

GIA COLOR-COMMERCIAL GRADING

D, E, F, G, H, I COLORLESS (WHITE)

J, K, L NEAR-COLORLESS (WHITE)

M FAINT YELLOW

N, O, P, Q, R VERY LIGHT YELLOW

S, T, U, V, W, X, Y, Z LIGHT YELLOW

Parts of the Diamond

CROWN (top) The crown consists of a large flat area on top called the table, and a number of facets. As the diamond catches the light, the job of the crown is to split the light entering the diamond into white light, which gives the stone its brilliance, and colored light, which gives it fire, or dispersion.
GIRDLE (middle) The girdle is the thin, unpolished band around the widest part of the diamond. The girdle protects the edge of the stone from chipping (even though diamond is the hardest natural substance on Earth, it can be chipped!)
PAVILION (bottom) The pavilion has the most important job: to reflect the light that passes through the crown back into your eyes. Think of it as a cone lined with mirrors. The light enters the diamond through the crown, splits into white and colored light, and bounces off the pavilion facets back up through the crown, where you see it as sparkle! But to achieve the maximum sparkle — that magic combination of brilliance and fire — the diamond must be well cut and cut in the proper proportions. The table, the symmetry of the facets, the girdle thickness, and the pavilion must all work together to make the diamond sparkle.
TABLE The size of the table, as a percentage of the crown, is important because it determines how much brilliance, or white light, the diamond will reflect. For example, if the table is 60% of the diameter of the crown, 60% of the light you see will be brilliance and 40% will be fire or dispersion. Avoid a diamond with a table area of 65% or higher. It will give the diamond too much brilliance, and not enough fire–and the diamond will look fuzzy or foggy.
FACETS The typical diamond has 58 facets, 33 on the crown and 25 on the pavilion. On a well-proportioned stone, these facets will be uniform and symmetrical. If they are not, the diamond’s ability to refract and reflect light will suffer.
GIRDLE You don’t want a diamond with a girdle that’s too thin, or one that’s too thick — you want one that’s just right! The whole purpose of the girdle is to protect the edge of the stone from chipping. A girdle that’s too thin doesn’t give enough protection. A girdle that’s too thick does protect against chipping, but it doesn’t look so good. So you want a diamond with a medium girdle, neither too thin nor too thick. How do you tell? Look at the diamond from the side. If it looks like there’s a white chalk line around the middle of the stone, the girdle is too thick. If you don’t see any girdle at all with the naked eye, look at the same area of the stone with a 10X loupe. If you can’t see a girdle with the loupe, it’s too thin.
PAVILION The job of the pavilion is most important of all: to reflect light. The light enters the diamond through the table, and the light rays pass through the crown and are refracted back by the pavilion facets. Here’s the important part: The angle of the pavilion for a round diamond must be between 40 and 41.5 degrees. 40.75 degrees is perfect. For marquise, pear, and oval cuts, the ideal angle is 40 degrees, with an acceptable range of 39.25–40.75 degrees. For emerald and rectangular cuts, the perfect angle is 45.05, and an acceptable range is 43.3-46.8 degrees. If the pavilion angle isn’t exactly right, it will not reflect light properly, and the diamond won’t have the sparkle it should.
CROWN ANGLE The angle of the crown is also important, but it doesn’t have to be quite as precise as the pavilion angle. The angle of the crown should be 32-35 degrees. If it’s smaller than 32 degrees, the diamond is what we call a spread cut.
CULET Finally, at the very bottom of the diamond–the base of the pavilion–there may be a small facet called the culet. If this facet is too large, when you look straight down through the table, the diamond will appear to have a hole in the middle. Make sure the stone has no culet or a very small culet.

Types Of Diamond Treatment

Treated Diamonds:

Some diamonds may be treated to improve their appearance. Since these treatments improve the clarity of the diamond, some jewelers refer to them as clarity enhancement.

One type of treatment – fracture filling – conceals cracks in diamonds by filling them with a foreign substance. This filling may not be permanent, and jewelers should tell you if the diamond you’re considering has been fracture-filled.

Another treatment of diamonds that have black inclusions or spots is Lasering. A laser beam is aimed at the inclusion. Acid is then forced through a tiny tunnel made by the laser beam to remove the inclusion. Lasering is permanent, and a laser-drilled stone does not require special care. While a laser-drilled diamond may appear as beautiful as a comparable untreated stone, it may not be as valuable. That’s because an untreated stone of the same quality is rarer and more valuable. Jewelers should tell you whether the diamond you’re considering has been laser-drilled.

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Category: Diamonds

Diamond Inclusions: What Are They?

Know your diamond inclustions before you buy

Pinpoint Inclusions

Feathers

Fringes and Bearding

Grain and Growth Lines

Cleavage

Laser Lines

Like this:

Diamonds

You should know the 4c’s.

Like this:

Diamond Certification: Why It’s Important?

Key Takeaways

Why Diamond Certification Matters (Yes, Even If You Think It Doesn’t)

Summary: 5 Most Important Points on Diamond Certification

Wait—What Is Diamond Certification, Anyway?

So, Why Should You Care?

1. It Protects You from Getting Ripped Off

2. It Tells You What You’re REALLY Paying For

3. It Helps with Insurance and Resale

What About Lab-Grown Diamonds?

Bottom Line: If It Doesn’t Have Certification, Don’t Buy It

Ready to See for Yourself?

Like this:

Diamond Cut, Clarity, and Color Explained

Diamond Cut, Clarity, and Color, or better known as the 4 C’s

Key Takeaways

Diamond Clarity

Diamond Color

Color:
Describes the amount of color the diamond has. This can range from colorless to yellow with slight tints of yellow, gray, or brown. Colors can also range from intense yellow to brown, blue, green, pink, and red. These fancy colors are rare and more valuable.

GIA COLOR-COMMERCIAL GRADING

D, E, F, G, H, I COLORLESS (WHITE)

Parts of the Diamond

Types Of Diamond Treatment

Like this:

Why Buying Jewelry Still Matters Face-to-Face in the Age of AI - Jewels Of Information From N.J. Diamonds

Know your diamond inclustions before you buy

Pinpoint Inclusions

Feathers

Fringes and Bearding

Grain and Growth Lines

Cleavage

Laser Lines

Share this:

Like this:

You should know the 4c’s.

Share this:

Like this:

Key Takeaways+

Key Takeaways

Why Diamond Certification Matters (Yes, Even If You Think It Doesn’t)

Summary: 5 Most Important Points on Diamond Certification

Wait—What Is Diamond Certification, Anyway?

So, Why Should You Care?

1. It Protects You from Getting Ripped Off

2. It Tells You What You’re REALLY Paying For

3. It Helps with Insurance and Resale

What About Lab-Grown Diamonds?

Bottom Line: If It Doesn’t Have Certification, Don’t Buy It

Ready to See for Yourself?

Share this:

Like this:

Diamond Cut, Clarity, and Color, or better known as the 4 C’s

Key Takeaways+

Key Takeaways

Diamond Clarity

Diamond Color

Color:Describes the amount of color the diamond has. This can range from colorless to yellow with slight tints of yellow, gray, or brown. Colors can also range from intense yellow to brown, blue, green, pink, and red. These fancy colors are rare and more valuable.

GIA COLOR-COMMERCIAL GRADING

D, E, F, G, H, I COLORLESS (WHITE)

Parts of the Diamond

Types Of Diamond Treatment

Share this:

Like this:

Why Buying Jewelry Still Matters Face-to-Face in the Age of AI - Jewels Of Information From N.J. Diamonds

Color:
Describes the amount of color the diamond has. This can range from colorless to yellow with slight tints of yellow, gray, or brown. Colors can also range from intense yellow to brown, blue, green, pink, and red. These fancy colors are rare and more valuable.