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Discover the World of Diamonds: Essential Knowledge for Jewelry Lovers
by Keyur Koshiya on Oct 24, 2024
Short answer: A diamond's quality is judged by the 4Cs: Cut (how well it returns light, and the biggest driver of sparkle), Color (D to Z, with D–F colorless), Clarity (FL to I3, based on inclusions) and Carat (weight, where 1 carat = 200 milligrams). Shape, such as round, oval or emerald, is a matter of taste. For the best value, choose an excellent cut, G–H color and eye-clean VS clarity, then pick the size you love. Lab grown and natural diamonds are graded the same way.
Diamonds can feel intimidating to buy. Grading reports are full of letters and numbers, and two stones that look similar in photos can be priced very differently. The good news is that the system behind those grades is simple once you know what each part means.
This guide covers the 4Cs, the most popular diamond shapes, how lab grown and natural diamonds compare, how to read a certificate, and how to choose a setting and metal. By the end you will know what to look for and where to save.
The 4Cs of Diamonds
The 4Cs (Cut, Color, Clarity and Carat) are the universal standards used to describe a diamond's quality and value. Each plays a part in a diamond's beauty, and understanding how they interact will help you find the right balance between quality and price.
| C | What it measures | Best-value range |
|---|---|---|
| Cut | How well the diamond returns light | Excellent or Ideal |
| Color | How colorless the diamond is (D–Z) | G–H (D–F for icy white) |
| Clarity | Inclusions and blemishes (FL–I3) | VS1–VS2, or eye-clean SI1 |
| Carat | Weight (1 ct = 0.2 g) | Whatever fits your style and budget |
1. Cut: The Key to Sparkle
Cut is the most important of the 4Cs because it directly controls how a diamond handles light. A well-cut diamond bounces light from facet to facet and back out through the top, creating the brilliance diamonds are famous for. A poorly cut diamond looks dull, even with excellent color and clarity.
What is diamond cut? Cut does not mean the diamond's shape. It describes how well the stone has been cut and polished: its proportions, symmetry and polish. The Gemological Institute of America (GIA) grades the cut of round diamonds as Excellent, Very Good, Good, Fair or Poor.
How cut affects brilliance: A diamond cut to good proportions returns as much light as possible, giving strong brilliance (white sparkle) and fire (flashes of rainbow color). An excellent cut looks brighter and livelier than a poor cut, even if both share the same color, clarity and carat weight.
Cut proportions: The angles and depth of a diamond decide where light goes once it enters the stone.
- Ideal cut: proportioned to return the most light, giving maximum brilliance and fire. These stones are highly sought after.
- Shallow cut: light leaks out through the bottom, so the stone looks glassy or washed out.
- Deep cut: light escapes through the sides, so the center can look dark.
Tip: If you can only stretch your budget on one C, make it cut. A smaller diamond with an excellent cut often looks more beautiful than a larger one with a mediocre cut.
2. Color: Evaluating Diamond Whiteness
Diamonds are graded on a color scale from D (completely colorless) to Z (a noticeable yellow or brown tint). The less color a diamond has, the rarer and more expensive it is. Most diamonds used in fine jewelry fall in the colorless to near-colorless range.
Color grades:
- D–F: colorless. The rarest and most expensive grades.
- G–J: near-colorless. A slight hint of warmth that is usually hard to see with the naked eye.
- K–M: faint color. More noticeable in larger stones, less visible in small stones or yellow gold settings.
- N–Z: very light to light yellow or brown tint, generally less valuable in white diamonds.
The effect of color on value: The difference between neighboring color grades is subtle. In many cases, a G–H diamond offers excellent value, because the difference from a D–F is hard to see once the diamond is set in jewelry. Metal matters too: yellow and rose gold make slight warmth less noticeable, while white gold shows the true whiteness of a colorless stone.
3. Clarity: The Presence of Imperfections
Clarity describes tiny internal features called inclusions and surface marks called blemishes. They form as the diamond grows, whether in the earth or in a lab. The fewer and smaller they are, the higher the clarity grade.
Clarity grades:
- Flawless (FL): no inclusions or blemishes visible under 10x magnification. Extremely rare.
- Internally Flawless (IF): no inclusions, only minor surface blemishes under 10x.
- Very, Very Slightly Included (VVS1 and VVS2): inclusions so small they are very difficult to see even under 10x.
- Very Slightly Included (VS1 and VS2): minor inclusions that are difficult to see under 10x and not visible to the naked eye.
- Slightly Included (SI1 and SI2): inclusions easy to see under 10x, and sometimes visible to the naked eye.
- Included (I1, I2 and I3): inclusions visible to the naked eye that may affect brilliance or durability.
Clarity in everyday wear: Flawless diamonds are prized, but many included diamonds are still stunning, especially when the inclusions are small or near the edge. VS and good SI1 diamonds often offer excellent value because their features are hard to see without magnification. The phrase to look for is "eye-clean": no inclusions visible from normal viewing distance.
4. Carat: The Weight of the Diamond
Carat measures weight, not size. One carat equals 200 milligrams, and diamonds are weighed to the hundredth of a carat. Larger diamonds are rarer and more valuable, but carat weight alone does not decide a diamond's beauty.
How carat weight affects price: Price rises sharply as weight goes up, because large stones are rarer. A 2 carat diamond usually costs much more than two 1 carat diamonds of the same quality. Prices also jump at popular weights such as 0.50, 1.00 and 2.00 carats, so a 0.90 carat stone can be good value and looks almost identical to a 1.00.
Carat weight vs. visible size: A well-cut diamond can look larger than its weight suggests, because it reflects more light. Shape matters as well: elongated shapes like oval, marquise and pear spread their weight across a longer outline, so they look bigger from the top than a round of the same carat weight.
Popular Diamond Shapes
The 4Cs describe quality; shape is about personal style. Each shape handles light differently and suits a different look. Here are the most popular choices.
To compare how big each shape looks in millimeters, see our diamond size chart, or browse lab grown diamond engagement rings in every shape.
1. Round Brilliant Cut
The round brilliant is the most popular and classic diamond shape. Its 57 or 58 facets (depending on whether the tip has a tiny culet facet) are arranged to return the most light, giving it the strongest sparkle of any shape. It is versatile and timeless, which makes it a favorite for engagement rings and stud earrings.
2. Princess Cut
The princess cut is a square or slightly rectangular diamond with pointed corners. It has a crisp, modern look and very good brilliance. Choose a setting that protects the four corners, such as V-prongs, because points are the most chip-prone part of any shape.
3. Cushion Cut
The cushion cut, sometimes called the "pillow cut," has rounded corners and larger facets. It has a vintage, romantic feel and comes in square and rectangular outlines. Cushions show strong fire, the colorful flashes many people love.
4. Emerald Cut
The emerald cut has long, step-like rectangular facets and a large, open table (the flat top), creating a "hall of mirrors" effect. It shows broad flashes of light rather than sparkle, and it highlights clarity, so choose a higher clarity grade for this shape. It suits buyers who want an elegant, understated look.
5. Oval Cut
The oval is an elongated version of the round brilliant. It offers similar sparkle while looking larger for its weight, and it can make fingers look longer and slimmer. Some ovals show a darker "bow-tie" area across the middle, so view the stone in a photo or video before buying.
6. Marquise Cut
The marquise is a long shape with pointed ends. It has the largest top surface for its carat weight of any shape, so it looks especially big. Its bold, regal outline works well as a solitaire or in nature-inspired designs.
7. Pear Shape
The pear, or teardrop, combines a rounded end with one point. It is graceful and flattering in pendants and drop earrings, and it is a striking choice for engagement rings. Like the marquise, it looks larger than a round of the same weight.
8. Radiant Cut
The radiant combines the clean rectangular or square outline of an emerald cut with brilliant-style faceting. The result is a lot of sparkle in a shape with trimmed corners, which makes it practical for active hands.
| Shape | Look | Good to know |
|---|---|---|
| Round | Classic, most sparkle | Usually the highest price per carat |
| Oval | Elongated, looks larger | Check for a bow-tie shadow |
| Princess | Modern square | Protect the corners |
| Cushion | Soft, vintage | Strong colorful fire |
| Emerald | Elegant step cut | Choose higher clarity |
| Marquise / Pear | Bold, looks larger | Protect the points |
| Radiant | Rectangular with sparkle | Trimmed corners, practical |
How to Balance the 4Cs on a Budget
Knowing the grades is one thing; deciding where to spend is another. This order works for most buyers, whether the stone is lab grown or natural.
- Set your budget and shape: shape changes both the look and the price per carat, so decide on it first.
- Lock in the cut: Excellent or Ideal for rounds, and a well-proportioned, lively stone for fancy shapes. Never trade cut away for size.
- Choose color by metal: D–F or G for white gold; G–I can look lovely in yellow or rose gold.
- Find an eye-clean clarity: VS2 or SI1 is often enough for brilliant shapes; go higher for emerald and Asscher-style step cuts, which show more.
- Spend what is left on carat: and consider weights just below the round numbers, such as 0.90 or 1.90 carats.
Following this order puts your money into what the eye actually sees: sparkle, whiteness and a clean face-up look.
Lab Grown, Natural or Moissanite?
Once you understand quality, the next decision is the type of stone.
- Natural diamond: formed in the earth over a very long time and mined. Valued for rarity and tradition, at a higher price.
- Lab grown diamond: a real diamond grown by the HPHT or CVD method. Chemically, physically and optically the same as a natural diamond, at a noticeably lower price for the same grades.
- Moissanite: not a diamond. It is silicon carbide, hardness 9.25 compared with diamond's 10, with a refractive index of about 2.65 (diamond is about 2.42). It shows more rainbow fire and costs less again.
| Feature | Lab grown diamond | Natural diamond | Moissanite |
|---|---|---|---|
| Is it diamond? | Yes | Yes | No |
| Mohs hardness | 10 | 10 | 9.25 |
| Sparkle | Classic diamond | Classic diamond | More rainbow fire |
| Relative price | Mid | Highest | Lowest |
Lab grown diamonds are graded with the same 4Cs, so everything in this guide applies to them. Explore lab grown diamonds or moissanite jewelry to compare.
Shop the styles in this guide
How to Read a Diamond Certificate
A grading report is an independent description of your diamond. IGI and GIA are among the best-known labs, and both grade lab grown and natural diamonds. A report typically shows:
- Report number: often laser-inscribed on the diamond's girdle so you can match stone to paper.
- Shape and measurements: the outline and size in millimeters.
- Carat, color and clarity: the core grades.
- Cut, polish and symmetry: how well the stone was finished.
- Fluorescence: whether the diamond glows under UV light. Faint or none is the usual preference.
- Origin: lab grown diamonds are clearly identified as laboratory-grown.
Tip: Compare the measurements, not just the carat weight. Two 1 carat diamonds can differ noticeably in face-up size if one is cut too deep.
Choosing a Setting and Metal
The setting protects the diamond and shapes the overall look.
- Prong: claws hold the stone and let in the most light. Classic for solitaires.
- Bezel: a metal rim wraps the stone. Very secure and modern.
- Halo: small diamonds circle the center stone and make it look bigger.
- Pavé: tiny diamonds line the band for extra sparkle.
Gold comes in different purities. 10K is the most durable and affordable, 14K is a popular everyday balance, and 18K has richer color and a higher gold content. Each is available in yellow, white and rose. White gold flatters colorless stones, while yellow and rose gold give a warmer, softer look.
Caring for Your Diamond Jewelry
- Clean it regularly: soak in warm water with mild dish soap, brush gently with a soft toothbrush, rinse and dry.
- Take it off for heavy work: gym sessions, gardening and cleaning with harsh chemicals can loosen prongs or scratch metal.
- Store pieces separately: diamonds can scratch other jewelry and even other diamonds.
- Check the setting: have prongs inspected by a jeweler from time to time, especially on everyday rings.
Shop Diamonds at Ivevar
At Ivevar, you can choose from lab grown diamonds, many with IGI certificates, and moissanite, set in 10K, 14K or 18K gold. We offer custom jewelry, virtual appointments, worldwide delivery with free shipping and 30-day easy returns (pierced earrings returnable only if faulty). Start with our lab grown diamond engagement rings, browse lab grown diamond fine jewelry, or explore lab diamond earrings.
FAQ
Which of the 4Cs matters most?
Cut. It has the biggest effect on sparkle, and a well-cut diamond can look brighter and even larger than a poorly cut stone with better color or clarity.
What color grade should I choose?
G–H is the sweet spot for most buyers, since it looks white once set. Choose D–F if you want an icy look in white gold.
What does eye-clean mean?
It means no inclusions are visible to the naked eye at normal viewing distance. Most VS and many SI1 diamonds are eye-clean.
Is carat the same as size?
No. Carat is weight. How large a diamond looks also depends on its cut proportions and shape.
Which diamond shape looks biggest?
Elongated shapes such as marquise, oval and pear usually look larger from the top than a round of the same carat weight.
Are lab grown diamonds graded differently?
No. They use the same 4Cs and grading scales as natural diamonds, and the report states that the stone is laboratory-grown.
Is moissanite a type of diamond?
No. Moissanite is silicon carbide, a separate gemstone. It is very hard and has more fire than diamond, but it is not a diamond.
Should I pay extra for a Flawless diamond?
Usually not. Flawless and VS diamonds look the same to the naked eye, so most buyers get better value by spending the difference on cut or size.
Can I see a diamond before buying online?
Ask for photos, videos and the grading report. At Ivevar you can also book a virtual appointment to see stones and settings with our team.
