4 carat diamond ring

4 Carat Diamond Ring Buying Guide

Categorized as Blog

Buying a 4-carat diamond ring for someone special is one of the biggest gestures you can make. It says so much more than “I love you.” It screams “Our bond is a thing of beauty and as rare and opulent as this unique and special ring!” So, why would you give the gift of anything less?

Deciding to purchase a 4-carat diamond ring is a huge investment and not something you just happen to do when passing the jewelers. You have to take the time to develop a deep understanding of a diamond’s unique qualities. Only once you’re armed with the knowledge of how carat weight, clarity, cut, and color influence the quality of a gemstone, can you create a 4-carat diamond ring worthy of your loved one.

Here we take you through all you need to know about 4-carat diamond rings so you’ll have the confidence to purchase a special ring that will be treasured forever.

Take the time to make it perfect.

Why Consider a 4-Carat Diamond Ring?

The average diamond engagement ring in the United States is between 0.8 and 1.2 carats. So, to present a ring to someone that represents how special they are, you need to think bigger.

A 4-carat diamond turns a simple ring into something spectacular. It creates a beautiful, eye-catching piece of jewelry with an unmatched sparkle, thanks to its size and the fiery surface that reflects light as nothing else does.

Although they’re considered large stones, 4-carat diamonds displayed in the right setting are the perfect size for rings. They make great pieces for everyday wear, but the rarity and beauty of the stones also make 4-carat diamond rings impressive enough to save for those special occasions.

Things to Consider When Buying a 4-Carat Diamond Ring

A 4-carat diamond ring is a big investment so, before making your purchase, there are several factors you should consider to ensure you choose the perfect gemstone and ring.


The weight of diamonds is measured in carats, with a 4-carat diamond weighing in at 800 milligrams, or 0.8 grams. A 4-carat round diamond measures approximately 10.1 mm in diameter.

Although all 4-carat diamonds are the same weight, they don’t necessarily appear to be the same size. This is something determined by the cut.

Diamond Size Chart


Four-carat diamonds are a rare commodity, which is reflected in the price. As a guide, these special gemstones cost anywhere between $40,000 and $250,000, and it’s not unusual to come across diamonds costing more than this.

The price you’ll actually pay for a 4-carat diamond is influenced by the size, cut, color, and clarity of the stone. Unless money is no object, understanding how these different elements affect the cost can help you stay on budget.

4 Carat Natural

ShapeTop Quality D/E, FL/IFOur Recommendation G/H, VS2/SIThe Lower End I/J SI1/SI2

4 Carat Lab Grown

ShapeTop Quality D/E, FL/IFOur Recommendation G/H, VS2/SIThe Lower End I/J SI1/SI2


The cut is an essential part of buying a 4-carat diamond ring, as it determines the brilliance of the gemstone and creates the eye-catching sparkle that helps a ring stand out.

Cut is the one element that you should prioritize over all others, as it influences how the diamond captures and reflects light. And, only an exceptional cut will reveal the true beauty of these gems.

Different cuts have different surface areas and depths, which affects how large the diamond appears. For example, an oval 4-carat diamond ring typically appears bigger on the finger than a radiant cut ring, even though they are of the same carat. This is because an oval cut gives the stone a greater surface area, and the elongated shape takes up more vertical space on the finger.

More popular cuts, such as round brilliant, tend to inflate the price of diamonds as they’re in high demand. If you’re on a budget, maybe consider a lesser-known cut that could be slightly more affordable. Your 4-carat ring will still be showstopping and will also be unique.


All gemstones, including diamonds, have some outer flaws known as blemishes and inner flaws called inclusions. These defects determine a 4-carat diamond’s clarity, measured using the Gemological Institute of America’s (GIA) grading scale. Gradings range from flawless, through VS1 and VS2 (very slightly included), and end at I3, which contains many inclusions.

The higher the gemstone’s clarity, the higher its value. It should also be noted that the larger the diamond, the more noticeable inclusions and blemishes become. For this reason, you’ll want to choose a 4-carat diamond that’s rated VS2 or higher, as flaws in these stones are impossible to see with the naked eye.


To the majority of people, all diamonds appear clear or translucent. But, to the trained eye, they have a subtle shading that makes a huge difference to the value. Again, color variations are more noticeable in larger diamonds due to the increased surface area, which can emphasize the yellowness of lower-grade stones.

Color is graded using a GIA scale ranging from D to Z, with D being colorless and Z having a yellowish hue. H is a good rating for a 4-carat diamond, especially brilliant cuts. However, you may want to consider an F or G for step cuts, such as emerald, baguette, or asscher, as they have fewer facets which allow more color to show through.

Achieve 4-Carats With Multiple Stones

It should be said that a ring featuring just one large 4-carat diamond is a true show-stopper. But, the same sparkle and jaw-dropping effect can also be found in rings with more than one stone.

Using multiple diamonds to achieve the magic 4 carats offers you the opportunity to create a truly unique, one-off ring for your partner. And, the finished product can give the impression of a much larger carat count.

Consider combining different cuts in a central cluster to bring depth, intrigue, and a large surface area for extra brilliance. Or, maybe enhance a smaller central stone by placing smaller stones beside or around it. The options are endless.

And, multi-stone rings allow you to play around with the size, color, and clarity of each individual diamond to help maximize your budget.

Three Stone Oval Diamond Engagement Ring
Three Stone Oval Diamond Engagement Ring

Lab-Grown Vs. Mined

Lab-grown diamonds are practically identical to mined stones, offering the same shine, brilliance, and sparkle for a fraction of the cost.

It’s unlikely that anyone will be able to tell the difference between a real stone and a synthetic one — unless you tell them. However, man-made diamonds tend to have small inclusions that natural gems don’t, although these are often unnoticeable to the naked eye.

Natural 4-carat diamonds are extremely rare and take nature billions of years to create. In contrast, synthetic stones are mass-produced and made in just a few weeks. For this reason, don’t expect a lab-grown diamond to increase or even hold its value.

Technological advancements mean that more and more synthetic diamonds are being produced, especially the weightier stones, and their popularity is soaring. So, there’s every chance that your man-made stone will fetch less than you initially paid if you decide to sell it in the future.

Therefore, if you’re purchasing a 4-carat diamond ring as an investment, think twice before opting for a cheaper synthetic stone.

lab grown diamond vs natural diamond

Finger Size

There’s no escaping the fact that a 4-carat diamond is a huge stone that will look substantial on any finger. That’s when you can play around with the cut.

Larger fingers could benefit from an oval or pear-cut diamond, making use of the increased surface area to give the appearance of a larger stone. If your loved one has slender fingers, consider an asscher, cushion, or emerald cut. These deeper cuts look slightly smaller when viewed from above, which will give the ring a more dainty appearance.

Bezel Set Asscher Cut Ring in Yellow Gold
Bezel Set Asscher Cut Ring in Yellow Gold


Diamond certification may not affect the look of a stone, but it does affect the price, as gemstones with certification are more expensive than without. However, it’s something you should consider when purchasing a 4-carat diamond.

Certification provides proof of the quality of your diamond and gives assurance that you’re buying what you’re paying for. Always ensure the certificate is from a reputable source, such as the GIA.

Styles and Setting

Style is a matter of personal taste when it comes to 4-carat diamond rings, and the advice is often to go with the heart. However, it’s important to take size and cut into consideration, as certain styles will struggle to accommodate certain stones.

Elongated Cushion Cut Solitaire in Rose Gold
Elongated Cushion Cut Solitaire in Rose Gold


The solitaire is a timeless classic and the most common style of ring. Due to its size, a 4-carat diamond may require the addition of a bridge to help support the stone and keep it securely in place while still allowing for maximum sparkle.

Pear Shaped Engagement Ring in Yellow Gold
Pear Shaped Engagement Ring in Yellow Gold


Cathedral rings are going through a surge in popularity and are an ideal setting for 4-carat diamonds. This vintage style is similar to a prong mount, with the stone placed on top of the shank and supported by metal arches on the sides and bearings beneath.

In addition to making the diamond more pronounced, the cathedral can be customized to create a truly unique design that’s personalized just for your partner. However, any customization will likely increase the cost of the ring, especially if you opt for an intricate design.


If size is important, consider a halo setting for your 4-carat diamond ring to have maximum impact. The addition of a circle of smaller diamonds will help highlight the central stone, making it more prominent, and creating the illusion of a bigger diamond. The extra gemstones will also add more sparkle to an already shining stone.

Wearability and Insurance Concerns

A 4-carat diamond ring is meant to be worn and shown off to the world. But, no matter how careful you or your partner is, there’s always the risk that something unforeseen could happen.

It would be heartbreaking if anything happened to a 4-carat diamond ring and, although diamonds may be the hardest gemstone known to man, they’re still susceptible to damage, loss, and theft. So, when purchasing this high-value piece of jewelry, you need to protect your investment.

Getting insurance for your ring as soon as you purchase it will give you peace of mind that you’re covered if it’s ever broken, lost, or stolen. You may be unable to replace the ring with the exact same 4-carat diamond, but you can afford a new gem that will be equally special.

Find Your Perfect 4-Carat Diamond Ring

Gifting the love of your life with a piece of jewelry that represents the unique bond you share can only truly be done with a 4-carat diamond ring.

It’s an investment that deserves special consideration so you find the perfect ring. Hopefully, we’ve given you all the information you need to make an informed decision and create the 4-carat diamond ring that tells your loved one how special they are. A beautiful, eye-catching piece that they will treasure forever.

4-Carat Diamond Ring FAQs

  • How much is a 4-carat diamond ring?

    A 4-carat diamond ring can cost anywhere between $40,000 to $250,000, maybe even more. Prices are dependent on the cut, color, and clarity of the stone. As a general rule, the higher the quality, the higher the cost. These diamonds are extremely rare and highly sought after.

  • How big is a 4-carat diamond?

    The average 4-carat round brilliant diamond weighs 0.8 grams and measures around 10.1 mm in diameter. All 4-carat diamonds weigh the same. However, even at the same weight, more elongated cuts, such as oval, pear, or marquise, may appear larger than a round brilliant. Asscher and cushion cut stones look smaller, as most of the weight is beneath the diamond’s girdle.

  • Is 4 carats too big for a ring?

    A 4-carat diamond is definitely considered a huge gemstone. However, choose the right cut and mount it in the right setting, and these stunning stones make the perfect ring. The diamond will appear prominent on the finger and is sure to turn heads with its shimmering brilliance.

  • What carat diamond is good for an engagement ring?

    The average engagement ring in the U.S. features a diamond that’s between 0.8 and 1.2 carats. So, to stand out from the crowd and create a truly special ring, you should consider something larger, such as 3 carats or above. If your budget stretches to one, a 4-carat diamond ring is a great option and a showstopper, thanks to its fiery surface and unmatched sparkle.

  • What cut is best for a 4-carat diamond ring?

    This is a matter of personal choice. A round or princess-cut 4-carat diamond has the largest surface area and really unleashes the sparkle. Marquise, oval, and other elongated cuts make the diamond appear larger so are best for larger hands, while slender fingers may benefit from asscher or cushion cut stones that appear smaller and more dainty.

By Peter Norman

Peter Norman is one of Los Angeles’ most celebrated wedding jewelers, with his custom-made engagement rings and wedding bands taking center place in thousands of weddings over the last 40 years. Each engagement ring is custom designed, built to order, and can suit any budget: from the simply elegant 1-carat solitaires to the exquisite pieces fit for (and sometimes purchased by) royalty.


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