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The Moussaieff Red Diamond is a breathtaking Fancy Red gem, widely regarded as one of the world’s largest and finest red diamonds with an iconic legendary standing across gemology and the global jewelry trade.

Unearthed as a 13.9-carat rough stone from a Brazilian mine in the 1990s, the raw crystal was meticulously cut and polished by William Goldberg Diamond Corp., refined down to a finished 5.11-carat gem originally named the Red Shield Diamond before being acquired by London-based luxury jeweler Moussaieff Jewellers and renamed after the brand. Certified by GIA, it boasts top-tier specifications: a coveted Fancy Red color grade—the highest ranking for red diamonds on GIA’s color scale, Internally Flawless (IF) clarity which is exceptionally scarce for colored stones, and a unique modified cushion triangular brilliant cut that optimizes fire and light performance. Pure red is the rarest hue among all fancy colored diamonds, with nearly all natural red specimens weighing under one carat; the Moussaieff Red remains the only known Fancy Red diamond above five carats, its unmatched pairing of Fancy Red and IF clarity a geological miracle linked to extreme mantle pressure and lattice plastic deformation deep within the Earth, whose exact color-forming mechanism is still actively researched by gemologists. Never listed for public auction or open market sale and lacking an official fixed price, gem experts value it well above tens of millions of US dollars (valued at roughly $8 million in the early 2000s, with its worth surging alongside the booming colored diamond market in subsequent years), and it has made rare public display appearances at prestigious institutions including the Smithsonian National Museum of Natural History in Washington D.C. and London’s Natural History Museum. More than a precious jewelry piece, this exceptional diamond is an irreplicable masterpiece forged by rare geological forces and masterful human lapidary craftsmanship, standing as an ultimate holy-grail collectible coveted by elite gem collectors worldwide.

Needle inclusions are common features found inside natural diamonds. They get their name for a simple reason. They are thin, elongated crystal formations that look just like tiny sewing needles. These fine, thread-like inclusions form naturally during a diamond’s growth cycle. Minor stress and subtle distortions in the diamond’s crystal lattice create these slender structures.

Some needles are tiny stretched diamond crystals. Others contain trace minerals like rutile. They may also hold small mineral residues left over from the stone’s formation. You cannot spot them with the naked eye. They only become visible under 10x magnification. Under magnification, they show up as thin straight lines, soft curved streaks, or gentle wispy lines. Most needle inclusions are white or transparent. Dark-colored needles do exist, but they are less common.

These inclusions do not affect all diamonds the same way. Their impact depends on four key factors: size, color, quantity, and placement. A single, small, faint needle causes almost no trouble. It is subtle and unnoticeable. It impacts clarity grade, appearance, and light performance very little. It is far less distracting than regular crystal inclusions or dark spots. It barely disrupts the diamond’s light transmission, brilliance, and fire.

The situation changes when needles are large, dark, or grouped together. Dark needles stand out sharply against clear diamond. They create strong visual contrast. Dense clusters of needles can even merge into cloud inclusions or twinning wisps. This noticeably lowers the diamond’s clarity rating. It scatters incoming light unevenly. The stone loses sparkle and visual brightness, which lowers its overall value. Location also matters a lot.

Needles sitting right below the table facet are highly visible. They catch the eye instantly. Needles near the diamond’s girdle stay hidden and unobtrusive.

Overall, needle inclusions are minor natural flaws in most cases. Scattered, tiny needles are harmless to diamond quality. They cannot be seen without tools. Interestingly, these unique internal marks are not always a downside. They give every diamond one-of-a-kind character. They act as natural proof of the stone’s genuine, unlab-grown formation.

Diamonds are the hardest natural substance on Earth. Still, they are rarely perfect. Completely flawless diamonds are extremely rare. Nearly all natural diamonds carry some kind of imperfections. These flaws fall into two main groups: internal features called inclusions, and surface marks known as blemishes. Learning about them is essential to understand diamond clarity grading. Collectively, they are referred to as clarity characteristics, which serve as the core standard to judge a diamond’s clarity grade.

Inclusions vs Blemishes

Inclusions are flaws inside a diamond. They formed deep underground under extreme heat and pressure while the diamond was crystallizing. These natural traces act like unique fingerprints, proving a diamond is naturally mined.

Blemishes refer to imperfections on the diamond’s surface. Most of them happen during cutting, polishing or daily wear.

Common Inclusions

Most inclusions can only be seen under 10x magnification. Here are the most typical types.

Crystal

They are tiny mineral crystals trapped inside the diamond. Crystals can be colorless, dark, red or green. Their color, size and position decide their impact. Dark crystals stand out more and hurt clarity and appearance more than pale ones.

Cloud

A cloud is made of countless tiny pinpoint inclusions clustered together. It looks hazy and foggy inside the stone. Large or dense clouds will reduce transparency and lower the clarity grade. Severe clouds can make a diamond look milky.

Feather

A feather is an internal crack with a feather-like shape. Small feathers rarely affect durability. But large feathers, those near the girdle or reaching the surface, may cause the diamond to chip or crack if hit.

Pinpoint

Pinpoints are tiny white crystal dots. They are one of the most common inclusions. Single or scattered pinpoints barely affect clarity. A large group of pinpoints will form a cloud.

Needle

Needles are long, thin and transparent crystal inclusions. Most are colorless. They seldom downgrade clarity unless they are big or numerous.

Twinning Wisp

It is a mix of pinpoints, clouds and small crystals, caused by distorted crystal structure during growth. It often appears as wavy or thread-like lines. Noticeable twinning wisps will bring down the clarity grade.

Common Blemishes

Most surface blemishes can be removed by repolishing. Sometimes a light polish is worthwhile to improve clarity. Yet experts may choose to leave them untouched, to avoid cutting down the diamond’s carat weight.

Extra Facet

It is an extra polished facet, usually made to remove a small inclusion near the edge. It is tiny and does not ruin look or durability.

Polish Lines

These are fine lines left on facets during polishing. On diamonds with excellent or very good polish, they are only visible under magnification. Poor polish lines will weaken a diamond’s luster.

Scratch

Scratches are thin marks on the surface. Minor scratches have little effect on clarity. Deep scratches can be fixed by repolishing.

Natural

A natural is a piece of the original rough diamond skin, mostly kept on or around the girdle. It is seen as proof of natural origin and is not considered a defect.

Chip

A chip is a small nick on the girdle or facet edges. It is caused by impact during cutting or wearing. Big chips will threaten the diamond’s durability.

Cavity

A cavity is an opening on the surface, left after removing a surface inclusion during polishing. Large cavities hurt clarity and easily collect dirt.

Why Clarity Matters

Clarity is one of the 4Cs that define a diamond’s quality, along with color, cut and carat weight. Graders evaluate clarity based on each flaw’s size, quantity, location, type and visibility.

Location matters greatly. Inclusions right below the table are much easier to spot than those near the girdle. The type of flaw tells its nature and potential risk to the diamond structure. Relief means the contrast between an inclusion and the surrounding diamond. Dark inclusions always show more clearly.

Authorities like GIA examine diamonds strictly under 10x magnification. They assign grades ranging from Flawless (FL) to Included (I3).

Inclusions and blemishes record a diamond’s long formation history underground. They are not always drawbacks. They are natural marks of a genuine diamond. It is not practical to chase a totally flawless diamond, for they are extremely rare and costly. A wise choice is to pick an eye-clean diamond — flaws cannot be seen by naked eyes, and will not harm beauty or structure. Always check official certificates such as GIA reports and consult reliable jewelers. In this way, you can fully know a diamond’s clarity features and make a smart purchase.

Not all diamond flaws are created equal. Some inclusions and surface blemishes are completely harmless. They do not affect the diamond’s beauty, brilliance, durability or daily wear. These minor imperfections are totally acceptable and worth buying, allowing you to get a high-quality, eye-clean diamond at a more reasonable price. However, certain critical flaws should never be overlooked. Some inclusions and cracks can impact the diamond’s structural stability, light performance and overall appearance. They may even lower the stone’s long-term value and durability. Many customers feel confused when selecting diamonds. It can be tricky to tell which imperfections are safe and which ones will cause future problems. If you have any doubts or questions during your diamond selection process, do not hesitate to reach out to us. Our professional team is always here to provide you with reliable, expert guidance to help you pick the perfect diamond for your budget and needs.

When people talk about diamonds, most of them will first think of classic colorless diamonds. But nature creates many stunning colored stones too. They are widely know as fancy color diamonds. These colored diamonds are extremely rare and one of a kind. Their value mostly depends on how rare their color is. So which fancy color diamonds are the hardest to find in the world?

First, let’s learn why diamonds get their color. Pure colorless diamonds are made of only carbon. Fancy color diamonds get their hues from small changes during their formation deep underground. There are three main reasons.

First is chemical impurities. For example, nitrogen turns diamonds yellow, and boron creates blue color. Second is structure defects. Twisted crystal lattice can make diamonds pink, red or brown. Third is natural radiation. This special effect forms green diamonds.

The rarest natural fancy color diamond in the world is red diamond. Below is the ranking of top rare colored diamonds, sorted by rarity, with simple explainations.

Extremely Rare：

Red Diamond

Red diamond is the king of all rare diamonds. It is no doubt the rarest one on earth. People still not fully understand how it gets its vivid red color. Most experts believe it is caused by plastic deformation during crystal growth. This tiny defect at atomic level absorbs certain light, and finally shows bright red.

Almost no pure red diamonds exist. Most red stones come with secondary tones, like purple, orange or brown. Only a few pure red diamonds have ever appeared on the open market. The most famous one is the Moussaieff Red, which weights 5.11 carats.

Blue Diamond

We are talking about vivid fancy blue diamonds here. Its color comes from the trace element boron. Boron hardly combines with carbon deep in the earth’s mantle. That is why natural blue diamonds form under very harsh conditions. Two world-famous examples are the Hope Diamond and the 14.62-carat Oppenheimer Blue.

Pink Diamond

Pink diamonds are beautiful and incredibly rare. Different from blue diamonds, their color does not come from impurities. Extreme pressure twists the carbon lattice and causes plastic deformation. This changes how light is absorbed and creates soft pink tones. The Argyle Mine in Australia was once the main source of pink diamonds. It closed in 2020, so pink diamonds become even harder to find today. The 59.60-carat CTF Pink Star is the most iconic pink diamond, and it sold for an amazing price at auction.

Moderately Rare：

Green Diamond

Natural green diamonds get their color from long time exposure to natural radiation. Real fancy vivid green diamonds are super rare. Most green color only stays on the stone’s surface. If cutters remove the colored part during polishing, the diamond will lost most of its value. The 41-carat Dresden Green is the most well-known green diamond.

Purple Diamond

Purple diamonds are unusual and rare. Their color is a mix of plastic deformation and hydrogen impurities. Pure purple diamonds are hard to find. Most have pink or grey overtones.

Orange Diamond

Pure bright orange is also called flame color. It is extremely scarce. The color is formed by both nitrogen and crystal structure flaws. Pure orange diamonds are even rarer than pink ones. Most orange diamonds on market carry brown or yellow shades. The 5.54-carat Pumpkin Diamond is its top representative.

Relatively Rare：

Yellow Diamond

Yellow diamonds are the most common fancy color diamonds. Even so, Fancy Vivid Yellow stones are still rare and valuable. Nitrogen is what gives them yellow color. Pale yellow or brownish yellow diamonds are easy to see. But saturated, bright canary yellow diamonds are worth a fortune. The 128.54-carat Tiffany Yellow Diamond is a world-famous treasure.

The world of diamonds is more than just colorless stones. From deep red to bright blue, every fancy color diamond is a unique miracle made by nature. Leibish is a professional supplier of fancy color diamonds. You can visit there official website to view all kinds of fancy colored diamonds, more review about leibish vist here…

A knot is an inclusion crystal that stretches all the way to a diamond’s surface. To put it simply, it is a tiny mineral crystal inside the diamond. During cutting and polishing, the stone is ground down until this inner crystal gets exposed. It starts as a regular inclusion, most often another diamond crystal or other mineral crystals. Since it breaks through the diamond surface, it counts as both an internal feature and an external blemish. That is why we need to pay extra attention to knots when picking diamonds. A knot is one of the most noteworthy clarity characteristics. It can bring real troubles to a diamond’s durability and overall look.

Why do we need to watch out for diamond knots?

A knot will lower the diamond’s clarity grade. More importantly, it leads to two major problems.

Durability Risk

This is the biggest concern. A knot sticks out on the diamond surface, so it is much weaker than the surrounding stone.

It chips easily. When being set into jewelry, especially under pressure setting, or hit and bumped during daily wear, the raised knot will chip far more easily than the rest part of the diamond.

It also makes maintenance hard. Even during regular jewelry cleaning or repair works, wrong operation may damage this fragile spot.

Visibility & Appearance Issues

White knots usually are small white or transparent dots if they are made of diamond crystals. As they sit right on the surface, their reflection is different from the main diamond. Sometimes they stand out more than other inclusions of the same size deep inside the stone.

If the knot consists of other minerals like garnet or pyroxene, it will turn dark or black. Dark knots are highly visible and do far more harm to the diamond’s appearance.

How to identify a knot on a GIA report

On the GIA clarity plot diagram, knots are marked with red symbols. Red marks always stand for features that reach the stone’s surface.

A knot may be labeled as a small dot or circle on the diagram, with the short form “Knt” next to it.

Here is an important tip. You have to check both the plot diagram and the written description. The diagram show you the exact location, while words like “Crystal, Knot” tell you what the inclusion is.

Buying advice: What to do when a diamond has a knot?

Try to avoid it first

For most buyers, especially those shopping for engagement rings worn every day, it is wise to stay away from diamonds with knots. This can save you from potential damage and appearance issues in the future.

Evaluate the situation carefully

If a diamond catches your eye for its great color, carat weight and good price, you need to make a full assessment.

Check its size and position. How big and noticeable is this knot? Does it locate on the pavilion or the crown?

Knots on the pavilion have lower risk. They are usually protected by prongs and the ring shank. They are hard to hit and barely visible from the front view.

Knots on the crown or girdle carry very high risk. These areas get hit all the time in daily life. Knots near the girdle are extremely easy to break during stone setting.

Check the clarity grade. If a diamond is graded SI clarity and its main inclusion is a knot, you need to be extra careful. Such knots are likely to be seen by naked eyes and even felt by touch. If the diamond is VS grade or higher, the knot is usually tiny, so the risk is much smaller.

Always check the real stone in person

Look closely. Use a magnifying glass to check the knot’s size, position and how much it sticks out.

Touch the surface gently. Feel if the knot is raised above the diamond.

Choose reliable sellers. Buy from trusted merchants who provide 360-degree high-definition videos. Watch the videos carefully to study the knot’s condition. Honest sellers will always tell you about the hidden risks clearly.

Conclusion

Knots are not the most common clarity characteristics, but they are definitely ones we cannot ignore. They ruin the diamond’s look and also create hidden durability risks.

Unless you fully understand and accept all the risks, or the knot is extremely small and placed in a safe spot, you had better choose a diamond without any knot for long-term wearing. A diamond with other inner inclusions, such as small internal crystals, clouds or feathers, is much safer than a diamond with a surface knot.

The name Flying Saucer Diamond is really vivid. It describes a diamond with an extremely shallow pavilion. When you look at it from the side, the girdle looks extra wide, while the pavilion part is extremely thin. The whole stone looks just like a flying saucer or a flat button.

This kind of cut has only one bad purpose. Cutters keep as much carat weight as they can, and make the table look much larger than it really is. It tricks buyers into thinking they get a big diamond. In diamond cutting industry, this is a clear negative term and a serious cut defect. It is also know as a worse version of fish eye diamond, or the extreme form of fish eye effect.

A flying saucer cut go against the core idea of diamond cutting. The goal of proper cutting is to maximize a diamond’s brilliance and fire. This bad cut brings many serious problems.

First, the diamond loss all brilliance and fire. It looks totally dull. A diamond shines because light enters the stone. The light reflect fully between pavilion facets, and finally bounce back through the crown to our eyes.

For flying saucer diamonds, the pavilion is too shallow. Light cannot reflect inside. It leaks straight out from the bottom. The stone turns dim and lifeless. It looks just like a plain piece of glass, with no sparkle at all. This is its biggest and worst flaw.

Second, it has obvious girdle reflection, also called severe fish eye effect. When you look down from the table, you will see a big, pale grey ring. This is the reflection of the thick girdle. The ring is large and clear. It makes the center of the diamond look empty and ugly. The whole stone lose its beauty completely.

Third, the structure is weak and easy to damage. The pavilion is super thin, so the girdle area become fragile. It is easy to get chips or cracks during setting or daily wear. This type of diamond has very poor durability.

How to spot a flying saucer diamond from a GIA certificate?

Do not only trust the overall cut grade. Some flying saucer diamonds can even get Good or Fair grade. You have to check the Proportions chart on the certificate carefully.

Pavilion Depth percentage is the most important index. If the number is below 40.0%, the risk is very high. A typical flying saucer diamond may have pavilion depth of 37% or even lower.

Total Depth percentage will also be too low. Total depth shows the full height of a diamond. Normal round diamonds have total depth between 57% and 63%. Flying saucer diamonds usually have total depth under 56%.

The Crown Angle is abnormal too. Cutters often use a very small crown angle to match the ultra-shallow pavilion.

The Girdle is extremely wide. The certificate marks girdle thickness. Most of these diamonds are marked Thick to Extremely Thick. Cutters barely polish the girdle, just to save weight.

Here is another easy way to judge. If both Pavilion Depth and Total Depth are unusually low, it is almost certainly a flying saucer diamond.

How to avoid buying this kind of diamond?

Learn to read the proportions on GIA reports. This is your first line of defense. Stay away from diamonds with pavilion depth below 40.0% and too low total depth.

Never buy a diamond only by its certificate. No matter how good the data is, check the real stone or watch 360° high-def videos from trusted sellers. Turn the diamond around. If you see a big grey ring on the table and no sparkle, do not buy it at all.

Choose reliable sellers. Pick well-known jewelry stores or online platforms, such as Blue Nile, James Allen( now belongs to Blue nile) and Whiteflash. They will filter out poorly cut diamonds in advance. They will not sell these bad stones to customers.

The fish eye effect is a common optical issue in diamonds. When you look straight down from the table, you can see the reflected edges of the pavilion facets. It forms a pale grey or white ring, just like the eye of a fish. A diamond with fish eye effect looks dull and lifeless. There is a dark empty circle right in the center. It lose its normal brightness and fire completely.

This problem is caused by poor cutting, which leads to serious light leakage inside the stone. The diamond looks dim and unattractive, just like a dead fish’s eye. This also tell us an important truth. We cannot choose a diamond only by the GIA Excellent cut grade. A high grade on paper does not always mean the diamond perform well in real view.

When you buy a diamond, you must check both the certificate data and the actual appearance of the stone. In this way, you will not only get a nice report, but also a real brilliant and beautiful gem.

What causes the fish eye effect?

The main reasons come from improper cutting. It mostly happens when the total depth is too shallow, and the crown angle and pavilion angle do not match well. Here are the key causes in detail.

First of all, a shallow pavilion. If the pavilion angle is too small, or the pavilion depth percentage is too low, light cannot create total internal reflection inside the diamond.

Then light leakage occurs. Instead of reflecting back to your eyes through the table, light escape directly from the sides of the pavilion. This is the core of the problem.

Because of such light loss, you can clearly see the reflection of the diamond’s girdle when looking from the top. A white grey ring will appear around the center. That is exactly the fish eye we talk about.

Here is a simple example to help you understand. Imagine a swimming pool that is too shallow. Standing on the bank, you can easily see the tile lines along the pool bottom. You cannot feel the deep sense of water at all. It is the same logic with diamonds.

How to spot potential fish eye effect from a GIA certificate?

We cannot confirm the problem 100% only by papers. But you can check the proportions section on GIA reports to rule out high-risk diamonds.

Low pavilion depth percentage is the biggest warning sign. Generally speaking, if the pavilion depth is below 40.0%, the risk of fish eye effect is very high.

A too small crown angle will make the situation worse. When crown angle is less than 30.6°, matching with a shallow pavilion, the fish eye issue become much more obvious.

Besides, an overly large table also raise the risk. When table percentage is over 62%, there are fewer facets to spread light evenly inside the diamond.

You need to keep one thing in mind. Even if the diamond is graded Excellent in cut, it may still have slight fish eye effect. GIA cut grading covers a range of proportions. Diamonds at the lower limit of Excellent grade often have much worse optical performance than top-level stones in the same grade.

How to avoid buying diamonds with fish eye effect?

Never buy a diamond just based on its certificate. This is the most important rule. Certificate is just a basic reference. Real inspection or high-definition videos are the key.

Study the proportions on GIA certificates carefully. Try to pick diamonds within the safe range. These are the ideal proportion ranges recommended in the industry:

Pavilion Depth: 42.5% to 43.5%

Crown Angle: 34° to 35.5°

Table Percentage: 54% to 58%

Total Depth: 59.0% to 62.5%

These are standard ideal ranges. A little out of the range does not definitely cause problems. But the further it deviates, the higher the risk will be.

Always check the diamond in person, or ask the seller for real videos.

If you can see the stone face to face, place it on a white paper. Look down from the table. If you notice a vague white or grey ring in the center, it has the fish eye effect.

If you shop online, ask reliable sellers for 360° high-definition videos of the diamond. Watch the video slowly. Turn the stone and check the front view again and again for any sign of fish eye. Trustworthy merchants will not sell such defective diamonds secretly. They will take initiative to tell customers about all existing flaws.

Buying diamonds just based on certificates is a very risky move. You may end up with a stone that has perfect data on paper, but looks disappointing in real life. Certificates like GIA reports work like ID cards for diamonds. They prove the basic features and official grades, but they can never guarantee how beautiful a diamond looks. Buying a diamond only with a certificate is just like hiring an employee only by their resume. A resume, which is similar to a diamond certificate, shows education, work experience and skills, just like the 4C standards on a report. But you cannot tell their real work attitude, communication skills and team work spirit. These equal to a diamond’s actual look and sparkle. If you do not want to spend a lot of money and feel regret later, you must check both the certificate and the real diamond. Do not just pay for a nice report. Choose a diamond that is truly bright and stunning.

Here are the main problems you may face if you only trust the certificate. First, you will miss the most important part: real appearance and optical performance. The 4Cs including color, clarity, cut and carat weight are graded by lab experts under controlled environment. However, people wear diamonds to admire their beauty, not to lock the certificate in a safe. Many people fall into the trap of milky diamonds or coffee diamonds. Some diamonds have massive cloud inclusions inside. They look foggy and hazy, which we call milky diamonds. Some carry obvious brown tones, known as coffee diamonds. Even if their clarity grade is not low, such as SI1 or VS2, those clouds will badly hurt brightness and transparency. The diamond looks dull and lifeless. Sadly, this kind of visual problem are not noted on most certificates.

A top Excellent cut does not always mean great sparkle and fire. There is a big range within the Excellent grade. Two diamonds both marked Excellent cut can be totally different. One with cut proportions just meeting the standard, and another with perfect proportions. Their sparkle, fire and brightness can have huge gaps. You can never know these differences only from a piece of paper.

Poor symmetry and polish are also common issues. Bad symmetry makes the table tilt and girdle uneven. It blocks light reflection and ruins the overall beauty. These details are written on certificates, but ordinary people can not imagine how bad they look in real view.

Second, you cannot judge a diamond’s unique charm and beauty. Every diamond is just like a person, it has its own style.

The position and visibility of inclusions matter a lot. Take two VS1 diamonds for example. One has inclusions hidden at the pavilion, so you can not see them from the top table. The other has marks right in the center of the table, just like obvious dust. The plotting diagram on the certificate marks the position, but you need to see the stone in person or watch professional photos to tell how noticeable it is.

Diamond fluorescence also creates different visual effects. Certificates mark fluorescence levels: none, faint, medium, strong and very strong. Strong fluorescence may make diamonds look foggy under sunlight and reduce clarity. On the other side, faint to medium fluorescence can make slightly yellow diamonds such as color J and K look whiter. This is a visual feeling you have to see yourself, you cannot tell good or bad just from words.

Third, you may buy so-called “data diamonds”. Many online sellers and wholesalers sell this kind of stones. They have perfect certificate data, but plain and ugly appearance. They know many buyers trust GIA reports and 4C numbers too much. They buy these flawed diamonds at low cost, then sell them with the slogan of high cost performance. You think you get a good deal, but actually you get a dull diamond with no shine.

Now let’s talk about the right way to buy diamonds: combine certificate check and real product evaluation.

A certificate is necessary for reference and quality guarantee, but it is not everything. Follow these steps.

Set your budget and 4C range first. Use the 4C rules to narrow down your choices. Read the plotting diagram carefully. Stay away from diamonds with inclusions on the table center or large cloud inclusions. Also make your choice on fluorescence level.

The most important step is to view the real diamond or watch professional videos.

If you visit physical stores, check diamonds under professional lights and natural daylight. Compare fire, brightness and transparency between different stones. Ask the shop staff to put several options together for comparison.

If you shop online, pick reliable sellers. Choose stores that provide high-definition magnified videos, 360° views, ASET and Idealscope images. James Allen ( note in 2026, james allen has joined bluenile) and Blue Nile are trustable online jewelry stores. These materials clearly show a diamond’s optical performance, making up for the lack of in-person viewing. Videos are much more reliable than static pictures.

Last, work with reputable jewelers or diamond consultants. They have rich experience and can guide you to avoid common traps.