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A quality 4 carat diamond is a rare beauty indeed. Happen upon a stunning diamond of this weight and it is likely to capture your heart. Significantly heavier than the average engagement ring (which is around 1.00ct), a 4-carat diamond ring has all the impact and intrigue that we so covet in diamond jewelry.

As carat weight increases, the guidelines on what to look for change a little. This guide will cover everything you need to know to find the 4-carat diamond of your dreams.

How Big is a 4 Carat Diamond?

The perceived ‘size’ of a 4-carat diamond is dependent upon cut quality and the diamond shape. A good cut results in a balanced diamond, with every facet working to its full potential for maximum sparkle.

Image courtesy Whiteflash

A 4-carat round brilliant diamond is around 10.4mm in size. At this weight, a diamond is likely to be prominent on the hand, turning heads with its brilliance. You will find measurements for a certified diamond on the diamond certificate allowing you to ascertain an accurate idea of size. Elongated shapes such as oval and marquise will give a bigger ‘face up’ appearance than other diamond shapes of equivalent carat weight.

If size is a leading factor in your search, remember that halo settings can increase the impact of a diamond.

How Much is a 4 Carat Diamond Ring?

An absolute minimum spend for a diamond of this weight would be around $17k, however ideally for a quality four carat diamond I would at quadruple that price ($60-80K). 

4.00 Carat E-VS1 Excellent Cut Round Diamond from James Allen

Unless you are one of the rare ‘money is no object’ buyers, it is likely your search will be governed by a budget. I commend this attitude. Setting a firm budget is the best way to find a diamond that is perfect for you, without having a bitter taste left in your mouth from over-spending. It may also be wise to slip under the 4 carat mark to get something of a better quality.

Another option is to consider lab diamonds! These offer a more affordable way of purchasing these larger diamonds. A 4 carat lab diamond will cost around $1,500 to around $5k depending on the cut quality - whilst one can purchase lab diamonds for less, they will have issues with transparency, fluorescence etc. It's important to remember that HPHT diamonds cost more to make than CVD diamonds, the quality of the material used to make the diamond is also important and the cut makes a massive difference. A super ideal cut diamond will take considerably longer to polish.

An example of a 4.02 ct E VVS2 Round Cut Precision Lab Grown Diamond from Whiteflash

Using the Four C’s to Buy a 4 Carat Diamond

When working with substantial prices, it is still crucial to understand how using the four c’s can help you stay within budget. Don’t over-spend on a quality that simply cannot be appreciated by eye.

Color

Color is greatly subjective. You may find yourself sensitive to color and thus needing a higher grade. For 4 carat brilliants I recommend a G-H in color and for step cuts an F-G is suitable. Step cuts are less adept at concealing color as brilliant cuts, but within these grades, your 4-carat diamond will give a bright white sparkle.

Clarity

Clarity assesses the amount of inclusions (internal) and blemishes (external) in a diamond. Although very common, the positioning and severity of inclusions can impact a diamond’s light return and, in some cases, affect durability. A VS2 clarity grade is the best place to start your search – websites such as Whiteflash will tell you if the diamond is ‘eye-clean’ meaning there are no inclusions visible to the naked eye. A wonderful tool to simplify your search.

Cut

What a tragedy it would be for a 4-carat diamond to suffer a poor cut. Cut is king and it is essential that great care is taken in choosing a diamond with the best possible cut. Unleash the full fire and brilliance by choosing the best cut you can afford with a GIA certification.

A step beyond…experience diamonds in their full glory by choosing a super-ideal cut. Designed and perfected for optical symmetry and light performance, a super-ideal cut diamond represents the best of the best. Take a look at the A CUT ABOVE® range by Whiteflash. If you're looking for fancy shapes, then visit either Blue Nile or James Allen.

Recommended Settings for 4 Carat Diamonds

Selecting the right setting for a 4-carat diamond is crucial for both security and aesthetics.

Petite Nouveau Six-Prong Solitaire Engagement Ring in 14k White Gold

Petite Nouveau Six-Prong Solitaire Engagement Ring in 14k White Gold from Blue Nile

Here are the best options:

  1. Four-Prong Setting:

    • Provides adequate security and maximizes light exposure for brilliance. Ensure prongs are thick and sturdy.

  2. Six-Prong Setting:

      • Offers greater security by distributing the diamond's weight evenly, reducing the risk of the diamond becoming loose.

    Platinum Vatche U-113 6-Prong Solitaire Engagement Ring for 2ct and Larger Diamonds available at Whiteflash

  3. Bezel Setting:

    • Encircles the diamond with a metal rim, providing maximum protection against chipping and impacts. Ideal for an active lifestyle.

  4. Halo Setting:

    • Surrounds the central diamond with smaller diamonds, enhancing size and brilliance while adding extra security.

  5. Pave Setting:

    • Features small diamonds encrusted on the band, enhancing sparkle and providing additional security to the central diamond.

Key Considerations

  • Security: At least four to six prongs or a bezel setting are recommended for stability.
  • Durability: Choose settings like bezel or halo for extra protection.
  • Style: Ensure the setting complements the diamond’s shape and wearer’s style.
  • Maintenance: Be aware that pave and halo settings may require more upkeep.

Where Can I Buy a 4 Carat Diamond Ring?

Quality 4 carat diamonds are extremely hard to come by and for diamonds of this size light performance and cut quality is imperative so I would recommend Whiteflash and  their A CUT ABOVE® Diamonds. If you're looking for a fancy shaped diamond then try Blue Nile and James Allen.

I also recommend these vendors because they offer quality settings. A 4-carat diamond must be securely set (ideally with at least 6 prongs or a bezel setting) to give peace of mind to the wearer and minimize risk of damage and loss.

Most of all, enjoy the process. I have helped thousands of diamond lovers find the ring of their dreams. Contact me for any advice and together we can find the perfect 4 carat diamond.