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What Is Carat?

What Is Carat?

When talking about diamonds, one of the first questions is almost always the diamond’s weight, or carat (ct). Carat is one of the most important numbers on a diamond certificate because it affects both how the stone looks and how much it costs.

In this article, I’ll make carat simple: what carat really means, where the unit came from, how it affects a diamond’s appearance, why shape matters more than you think, and why price doesn’t increase linearly.


Quick Summary

  • 1 carat (1.00 ct) = 0.2 g, or 200 mg.

  • Carat is weight, not diameter—though a higher weight usually also means a larger visual size.

  • Two diamonds with the same carat weight can look different because shape and cut change the visible surface area.

  • Price increases with carat not in a straight line, but in jumps (rarity).

  • A higher carat often means a taller setting and more attention to ring design.


What Is Carat?

Carat (ct) is the unit of weight used for diamonds and other gemstones.

  • 1 ct = 200 mg = 0.2 g

Even though carat refers to the stone’s weight, it also affects visual size—because higher weight usually means larger measurements, especially with a round brilliant cut.


Where Did the Word “Carat” Come From?

The word “carat” comes from old trading practices. Long ago, gemstones were weighed using carob tree seeds (carob tree seeds) because their mass was considered consistently the same, around 2 g. Over time this practice became a standard, and eventually “carat” was standardized into the modern unit used worldwide today.

 


How Carat Affects a Diamond’s Visual Size

Carat tells you how heavy the stone is, but the “size” you see also depends on how the diamond is cut and what shape it is.

In general (for a round brilliant), the higher the carat, the larger the diameter—but:

  • if a diamond is cut too deep, it can be “heavier” but look smaller from the top

  • if a diamond is cut too shallow, it can look bigger but won’t sparkle as well

  • if a diamond is cut to an ideal depth, it creates beautiful sparkle

How Does Diamond Shape Change the Perceived “Size”?

Two diamonds with the same carat weight can appear different in size depending on the shape, because the shape determines how much surface area the stone covers when viewed from the top.

Practical examples:

  • Oval: often looks larger and visually elongates the finger

  • Emerald / Radiant: longer and often lower proportions—can look larger and elongate the finger

  • Marquise / Pear: often look larger than their weight suggests because the shape stretches the outline

If your goal is visual size, choosing the right shape is one of the best ways to “play” with proportions.

 


Why Does Carat Increase Price So Quickly?

As carat increases, the price usually rises exponentially, not “proportionally.”

Why?

  • large diamonds are significantly rarer

  • even rarer is a large diamond with excellent cut, color, and clarity at the same time

  • certain “thresholds” (for example 1.00 ct) are psychological milestones in the market and push prices up

That’s why a 0.90 ct can sometimes be much better value than a 1.00 ct, even though the visible difference is small.


How Carat Affects Ring Design

The larger the stone, the more it affects the entire ring’s construction.

  • a larger diamond needs a stronger setting

  • the stone is often set higher (so the prongs can hold it securely)

  • proportions must be right: band width, stone height, overall balance

Large stones are visually very elegant and eye-catching—but precisely because of that, the design must ensure that:

  • it’s comfortable for everyday wear

  • the stone is protected

  • the ring doesn’t constantly snag


Summary

Carat is a simple number everyone asks about—but the best choice happens when you look at carat together with shape, cut, and proportions. The most beautiful result doesn’t always come from the “biggest” stone, but from the best-proportioned stone that fits your budget and style.


color, värvus, teemant, keefirivunts, kihlasõrmus

What Is Diamond “Color”?

If you’re looking for a diamond engagement ring, “color” is one of those parameters that can seem extremely important on paper… but in real life it’s often very simple: many color differences are minimal to the naked eye, and the right choice depends more on what metal the ring is made of and what your budget is.

In this article I’ll explain:

  • what “color” really means,

  • which ranges are the most sensible,

  • and how the metal (white vs yellow) affects what you see.

 


Quick Summary

  • Diamond “color” means how colorless (or how warm/yellowish/brownish) a diamond is.

  • The scale usually runs from D (most colorless) to Z (warmest/most yellow).

  • To the naked eye, the difference between D–F and G–J is often very small—especially with a good cut.

  • White gold: often best is D–G.

  • Yellow/rose gold: you can often go warmer, for example G–J, because the metal reflects a warmer tone through the stone anyway.

  • “Cut” affects how “white” a diamond appears—often more than one color grade.


What Is Diamond “Color”?

For classic white diamonds, color refers to how much warm tone (a yellowish tint) the diamond has. The more colorless, the rarer and generally more expensive.

Color is graded on a standard scale:

  • D–F: colorless (the whitest and most expensive)

  • G–J: near colorless (very popular because the price-to-appearance ratio is often best)

  • K–M: noticeably warmer tone (some people love this “champagne” vibe)

  • N–Z: clearly warm tone

Important: “color” is not the same as diamond shape or fluorescence. Those are separate characteristics.


Is “D” Always the Best?

Technically, D is the most colorless. But the best choice depends on what you want to achieve.

Why D isn’t always the right choice:

  • The premium for D–F can be large, while the visible difference compared to G/H can be small (especially with a well-cut diamond).

  • If the ring is in yellow gold, an ultra-white stone can sometimes look “contrasty,” while a slightly warmer tone can blend more harmoniously.

A simple idea: you pay the most for color when you choose the most colorless grades. For many people, it’s smarter to choose “near colorless” and put the budget into cut or carat instead.


Metal Matters: White Gold vs Yellow Gold

White gold (and “white metals” in general)

In white metal, everything reflects “cooler” next to the diamond—so a warm tint can be easier to notice.

Practical range:

  • Very safe: D–H

  • Smart-buy sweet spot: G–H

Yellow or rose gold

Warm metal softens the tone next to the stone and can “blend away” some yellowness. Many people can choose a warmer color grade in yellow gold at a better price—without the warmth feeling distracting.

Practical range:

  • Very popular: F–J

  • Smart-buy sweet spot: H–J (depending on your eye and style)


What Do You Actually See with the Naked Eye?

Most people notice color:

  • mainly from the side (in profile), not from the top,

  • when the stone is very large

  • or when the cut is average and the stone can be compared directly next to a D-color diamond

That’s why cut is so important: a good cut increases light return and can make a diamond look whiter—even if the color grade is lower.


Color vs “Fancy Color” Diamonds

The standard D–Z scale applies to white diamonds. If a diamond is truly colored (pink, blue, yellow, etc.), it’s called a “fancy color.” The logic is different there: color is a virtue, not a flaw.

If you’re looking for a classic engagement ring, most choices usually stay within the D–J range.


How to Make a Confident Choice

If you want the stone to look “white”:

  1. Choose the metal (white vs yellow)

  2. Set your priority: do you want a larger carat, or a more “icy” tone?

My practical recommendations

  • White gold: start targeting D–H (very good value)

  • Yellow/rose gold: start targeting H–J (often the best price-to-effect ratio)

  • If the budget is tight: don’t sacrifice cut—rather choose a slightly warmer color and keep the cut very good.


Summary

Diamond color matters—but not as much as it first seems. For many engagement rings, the smartest choice isn’t the “coldest” D, but a well-cut diamond in a sensible color range that matches the metal tone.


kihlasõrmus, teemant, puhtus, kvaliteet

What Is Diamond “Clarity”?

If you’re looking for a diamond engagement ring, you’ll inevitably run into the 4Cs. Carat refers to size (weight), color refers to the diamond’s tone, cut shows how brilliantly the diamond sparkles… and then there’s clarity—meaning the diamond’s clarity/cleanliness.

Clarity is one of the most misunderstood topics, because on paper it seems like “the cleanest = the best.” In reality, for an engagement ring it’s often smarter to aim for an eye-clean diamond: a stone that looks clean to the naked eye.

 


Quick Summary

  • Clarity shows how many internal and external “marks” a diamond has.

  • Most diamonds are not perfect—and that’s normal.

  • The practical goal when choosing a stone for an engagement ring is eye-clean (clean to the naked eye).

  • Very often the best price-to-quality balance is VS2 – SI1 (depending on shape and the stone’s characteristics).

  • For step cuts like emerald/asscher, clarity matters more than for round/oval diamonds.


What Is Clarity?

A diamond’s clarity describes its internal and external features, commonly called “inclusions” and “blemishes.”

  • Inclusions: features inside the diamond (e.g., tiny crystals, lines, particles)

  • Blemishes: small surface features (e.g., scratches, dots, surface marks)

These form during the diamond’s growth in nature or during the growth process (lab-grown diamonds can have them too). A clarity grade is not about “is the diamond real,” but “how clean is this specific stone.”


The Clarity Scale (Simple and Clear)

Certificates usually use a grading sequence like this:

  • FL (Flawless): no inclusions or blemishes visible under 10x magnification

  • IF (Internally Flawless): no internal inclusions; only tiny surface marks

  • VVS1 / VVS2: very, very small inclusions—hard to see even at 10x

  • VS1 / VS2: very small inclusions—visible at 10x, usually eye-clean

  • SI1 / SI2: small inclusions—more visible at 10x; SI1 is often eye-clean, SI2 depends on the stone

  • I1 / I2 / I3: inclusions often visible to the naked eye and may affect beauty or durability

If you want a simple rule:

FL–VVS is “perfect,” VS–SI is a smart choice, and I depends on what the wearer wants.


What Does “Eye-Clean” Mean—and Why Is It the Smartest Target?

Eye-clean means: no visible flaws in normal lighting when viewed with the naked eye.

In real engagement-ring life:

  • no one looks at a diamond with a loupe

  • people see sparkle and the overall impression

  • and if the stone looks clean, it looks luxurious

That’s why with FL/VVS you’re often paying for microscopic perfection. An eye-clean stone (VS2 or a good SI1) can look identical in practice—while offering much better value.


Does Clarity Affect Sparkle?

Yes—but not always in the way people assume.

  • Small inclusions in the VS/SI range typically don’t affect sparkle if the cut is good.

  • Very large or poorly placed inclusions can:

    • reduce transparency

    • create haziness

    • or disrupt light performance

But in practice, for an engagement ring the priority usually is:

  1. Cut

  2. Clarity (eye-clean in real life)

  3. Color

  4. Carat


Which Inclusions Are “Okay,” and Which Are Better to Avoid?

It all depends on location, size, and type.

Often okay (especially if small and near the edge)

  • tiny crystals near the edge

  • small “needle” lines

  • tiny dots that aren’t in the center

Usually worse (especially if large and centered)

  • large feathers that reach the edge (can affect durability)

  • a large black carbon spot in the center (noticeable)

  • a large cloud (haziness) that makes the stone look dull

  • inclusions right under the surface (the most visible area)

If a stone is SI1 or SI2, what really matters is what type of inclusion it is and where it sits.


Shape Matters: Not All Cuts Show Clarity the Same Way

  • Round / oval / cushion: hide inclusions better (the sparkle pattern masks them)

  • Emerald / asscher: can show inclusions more clearly because the facets are broader

That’s why with an emerald-cut diamond, it can be smart to go a bit higher in clarity than you would for a round.


Practical Recommendations (What I Would Do)

If you want a classic, beautiful choice on a sensible budget:

  • Round / oval / cushion: aim for VS2 – SI1 (eye-clean)

  • Emerald / asscher: often aim for VS1 – VS2 (so it looks clean)

  • If the budget is tight: choose a better cut and keep clarity wisely at an eye-clean level


How to Choose Clarity Safely If You Can’t See the Stone?

  • Ask for the certificate and the inclusion plot (where the inclusions are)

  • Ask for a video of the stone (good light, rotating)

  • Ask the seller directly: “Is this stone eye-clean?” and ask them to explain under what angle and lighting

  • If possible: view it in daylight and indoor light


Summary

Clarity is the diamond’s internal and external features—part of the diamond’s story. But with an engagement ring, the goal isn’t to pay for a microscope. The goal is that the stone looks genuinely beautiful and clean.

If you want a smart, confident choice:

  • choose a better cut,

  • aim for eye-clean clarity


teemant, kihlasõrmus, cut, lõige lihv, keefirivunts

What Is a Diamond’s “Cut”?

When we talk about choosing a diamond engagement ring, most people ask about carat first. But if your goal is a truly sparkling diamond, the most important “C” is actually Cut.

Cut is what determines:

  • how much light the diamond reflects back,

  • what kind of sparkle and scintillation you see,

  • and whether the diamond looks bright—or rather dull.

In this article I’ll explain what diamond cut is, the differences between cut grades, what to check on a certificate, and how to make a smart choice for an engagement ring.

 


Quick Summary

  • Cut = sparkle.

  • A well-cut diamond can look larger and brighter than a poorly cut stone of the same carat weight.

  • Keefirivunts recommendation: choose Excellent/Ideal, or at minimum Very Good (depending on budget).

  • Cut ≠ shape. Shape is round, oval, emerald, etc. Cut tells you how well that stone has been proportioned and finished.


What Is a Diamond’s Cut?

Diamond cut refers to the diamond’s proportions, symmetry, and polish—in other words, how the stone has been fashioned so light moves through it correctly.

A well-cut diamond:

  • allows light to enter,

  • reflects it back at the right angles,

  • and creates maximum brilliance and sparkle.

A poorly cut diamond can leak light “out the sides” or “out the bottom,” and therefore look dull—even if it’s large and has high clarity.


Cut Grades (What You’ll See on a Certificate)

On most grading reports, the cut for round brilliant diamonds is typically graded on a scale like this:

Ideal / Excellent

The highest grade. Maximum brilliance and light return.

In practice: if you want the diamond to “come alive,” this is the safest choice.

Very Good

A very strong option—often nearly the same visual effect as Excellent, but sometimes a bit more budget-friendly.

Good

Already a compromise: the diamond can still be pretty, but sparkle and “fire” may be noticeably more subdued.

Fair / Poor

Keefirivunts does not recommend (and does not offer) diamonds graded Fair or Poor, because that’s where the “why doesn’t it sparkle?” problem often starts.


Why Is Cut So Important for an Engagement Ring?

An engagement ring is jewelry you look at up close—every day. When the cut is strong:

  • the diamond looks more “expensive,”

  • sparkle shows up both in daylight and indoor light,

  • and the stone can even look visually larger.

Simple rule: Cut is what makes a diamond feel like a diamond.


Diamond Anatomy (Simple, So You Can Read a Certificate)

On certificates and in diamond descriptions you’ll often see these terms:

  • Table – the largest top facet of the diamond

  • Crown – the upper part from the girdle to the table

  • Girdle – where the crown and pavilion meet (the diamond’s perimeter)

  • Pavilion – the lower part from the girdle down to the culet

  • Culet – the very bottom “point,” ideally not visible to the naked eye

  • Depth – the diamond’s height (table → culet)

  • Diameter – diameter from one girdle edge to the other (especially important for round diamonds)

These proportions directly affect whether light:

  • returns to your eye,

  • or “leaks away.”


PS: Cut and Shape Are Not the Same Thing

This often causes confusion.

  • Shape: round, oval, emerald cut, cushion, pear, etc.

  • Cut quality: how well that shape has been cut and finished

For example: “oval” is a shape, but an oval can be beautifully cut—or poorly cut.


How Does Cut Affect Diamond Price?

A great cut costs more because:

  • it requires more skill,

  • often more rough material is sacrificed during cutting,

  • and top-cut stones are less common.

But this is the place where your money is truly “visible”:

  • a stone of the same carat can feel luxurious in Excellent cut,

  • but look “cheap” or dull in a weaker cut.

If you have to choose, it’s better to go:

  • slightly smaller carat + Excellent cut

    than

  • larger carat + average cut.


How to Make a Confident Choice (A Small Checklist)

If you’re choosing a diamond based on the certificate:

  • Choose cut: Excellent/Ideal (or Very Good if budget requires)

  • Also check:

    • Polish – Very Good / Excellent

    • Symmetry – Very Good / Excellent

  • Always ask for a video of the stone or view it in different lighting (if possible)


Summary

A diamond’s cut is one of the most important factors when choosing an engagement ring. Cut determines whether the diamond:

  • sparkles,

  • scintillates,

  • and looks truly luxurious.

If you’d like to order your engagement ring from Keefirivunts, feel free to reach out—we’ll help you find a diamond that fits your budget, style, and values.


kihlasõrmuse suuruse mõõtmine

Can an Engagement Ring Be Resized Later?

Choosing an engagement ring is a big step—it symbolizes commitment and love. And it’s completely logical to feel nervous about the size: “But what if I choose the wrong size… can it be changed later?”

On top of that, a lot can change over time: your body, hormones, training, pregnancy, seasons—and with that, finger size can change too.

Good news: yes, in most cases an engagement ring can be resized later.

But it depends on the ring’s construction, the stone setting, and the material.


Quick Summary

  • Most classic engagement rings can be made either larger or smaller.

  • Small adjustments (for example ~half a size) can sometimes be done by stretching, but often the ring still needs to be cut and material added/removed.

  • Complex designs (stones all around, special constructions, certain patterns) may have limitations.

  • After resizing, white gold may need re-rhodium plating so the color looks even.


Why Is This Such a Big Topic?

In the past, many couples chose the engagement ring together before the proposal—so the size was usually correct. Today, more people do surprise proposals, which is romantic, but it also means the size isn’t always perfect. And that’s completely okay, because in most cases the size can be adjusted.


How Is an Engagement Ring Resized?

1) Consult a jeweler

The first step is always the same: contact a goldsmith or jeweler who will assess:

  • how much it needs to be changed

  • whether the design allows resizing

  • whether stones need to be removed and re-set

  • whether surface finishing is needed afterward (for example rhodium plating)


2) Resizing by stretching (small adjustment)

In some cases, a ring can be stretched slightly larger without adding material.

This often works when:

  • the band is a simple plain ring

  • there are no stones all the way around the ring

  • the change needed is small (often around half a size, depending on construction)

For example, if you want to change from 16 mm to 16.5 mm, stretching may be possible.


3) Resizing by cutting the band (bigger change / making it smaller)

If you need to:

  • make the ring smaller, or

  • make the ring larger than a small stretch would allow,

then the band is cut and:

  • material is removed (to make it smaller)

  • material is added (to make it larger)

  • then it’s soldered back together and finished so the ring looks seamless

Sometimes this also means stones must be removed temporarily and re-set—especially if stones are close to the cut point or the construction is delicate.


4) Laser welding (safer for rings with stones)

The logic is similar to traditional soldering, but the big advantage is that the heat is very localized.

This is often the best option when:

  • the ring has gemstones

  • the design is delicate

  • you want to minimize heat impact on the stones and the rest of the ring


5) Rhodium plating and finishing after resizing

If the ring is:

  • white gold and rhodium plated, it usually needs to be re-plated so that:

  • the tone is even

  • the surface looks fresh and bright

(With yellow/rose gold, finishing and polishing are also typically done after resizing so the solder line isn’t visible.)


Is It Always Possible?

Most of the time, yes—but there are exceptions and limitations.

Usually easier to resize when:

  • the design is classic (one center stone)

  • the band is plain and doesn’t have stones around it

  • the metal is gold (585/750)

Limitations can happen when:

  • stones go all the way around the ring (full eternity)

  • the design has a complex pattern or engraving that must stay exactly the same

  • the construction is very delicate or an unusual shape

  • a very large size change would throw off proportions (stone position, setting angle, shank balance)

That’s why the best approach is always: a jeweler looks at the specific ring and tells you exactly what’s safe.


Final Thought

Ring size shouldn’t stop you from buying an engagement ring. Most engagement rings can be adjusted later—and if the goal is a surprise, it’s completely normal to fine-tune the size afterward. Our general recommendation: when in doubt, choose a slightly larger size—then the ring will fit at the most important moment!


teemanti 4c d, keefirivunts

Diamonds and the 4Cs: How to Choose the Right Stone

Whether we’re talking about a lab-grown diamond or a natural diamond, one concept always comes up in the diamond world: the 4Cs. These are the four main factors used to evaluate a diamond’s quality, appearance, and overall value:

  • Carat (carat weight)

  • Cut (cut / finish)

  • Color (color grade)

  • Clarity (clarity)

When you understand the 4Cs, you can make a smart choice even if you can’t see every stone in person—because these grades are always listed on the certificate.


Quick Summary

  • Cut is the most important, because it determines sparkle.

  • Carat is size (weight), but on its own it doesn’t tell you anything about beauty.

  • Color and Clarity should be chosen so the diamond looks “eye-clean” and matches the metal tone.

  • A good formula: Cut first → then eye-clean clarity → then the right color → only then carat.


What Are the 4Cs?

1) Carat – size (weight)

Carat is the unit used to measure a diamond’s weight.

  • 1 carat = 0.2 g (200 mg)

The higher the carat weight, the rarer and generally more expensive the diamond—but here’s an important nuance: carat does not directly determine sparkle. A sparkling diamond isn’t a big diamond—it’s a very well-cut diamond.

Fun fact:

The word carat is linked to carob tree (carob) seeds, which were historically used as a reference weight because their mass was considered consistent.

Practical tip:

Two stones with the same carat weight can look different in size because:

  • cut and proportions vary

  • shape changes the face-up look (oval/pear/marquise often look larger)

 


2) Cut – the king of sparkle

Cut is what determines how well a diamond reflects light back. Even a very clean and colorless diamond can look “dull” if the cut is average.

When grading cut, the main things evaluated are:

  • proportions (height, table, depth, etc.)

  • symmetry

  • polish quality

What should you choose for an engagement ring?

  • If you can: Excellent / Ideal (depending on the grading lab)

  • If you need to save somewhere, then don’t save on cut—it’s the most visibly noticeable diamond feature.

 


3) Color – how colorless the diamond is

Color refers to the level of yellow tint in a diamond. The classic scale runs from:

  • D = completely colorless

  • to Z = noticeably yellowish/brownish

The less color, the rarer and usually more expensive the stone. But to the naked eye, the difference between “perfect” and “very good” is often surprisingly small—especially if the diamond has a strong cut.

Practical ranges:

  • White gold: D–H often works beautifully

  • Yellow/rose gold: F–J can be very sensible, because the warm metal tone “blends” a slightly warmer diamond

Extra note:

Fancy color diamonds (pink, blue, etc.) are a world of their own—these can be extremely rare and very expensive.

 


4) Clarity – what’s inside the stone (and whether it matters)

Clarity describes a diamond’s internal and external “marks”: inclusions, dots, lines, and more. Most diamonds are not perfectly clean—and that’s normal.

Clarity scale (simplified):

  • IF = internally flawless

  • then VVS / VS / SI

  • down to I1–I3 = more noticeable inclusions

What should you choose for an engagement ring?

For most people, the goal is eye-clean: clean to the naked eye.

Practical recommendation:

  • often VS2–SI1 is more than enough (depending on shape and the stone itself)

  • don’t automatically pay for “IF” or “VVS” if you won’t see the difference in everyday life

 


How to Use the 4Cs in Real Life (A Simple Formula)

If you want your diamond to look “expensive” and alive:

  1. Cut (don’t compromise here)

  2. Clarity (aim for eye-clean)

  3. Color (choose based on the metal)

  4. Carat (choose a size that fits your budget)

Why does this work?

Because sparkle and the “wow” feeling come mostly from cut—plus the diamond looking clean and clear in real life.


Summary

The 4Cs give you a clear framework for choosing a diamond without overpaying and getting the best result. Carat is the most obvious number—but cut is what truly makes a diamond come alive.


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