How Much Is a 4-Carat Lab Diamond? (2023 Price)

How much does a 4-carat lab diamond cost? They're up to 80% cheaper than mined diamonds, but learn exactly much they cost and how to save on lab diamonds.

Last Updated on September 30, 2023 by Klaus T

SALES ALERT! Save at our best-rated lab diamond jewelers:

The price of a diamond can differ considerably based on its grade and where it’s bought. For instance, the price of a 4-carat lab-created diamond can range from as little as $3000 to as high as $7500, depending on its 4Cs and how rare it is. The average cost of a 4-carat lab-created diamond with a popular brilliant-cut round shape is around $4500, which is approximately 86% less expensive than the exact same mined diamond.

How much does a 4-carat lab-grown diamond cost?

4-carat lab diamond prices range from $3000 to $7500, depending on the quality. An excellent quality 4-carat lab-grown diamond costs around $4000-5000, which is up to 86% less than a mined diamond!

In our guide on the cost of a 4-carat lab diamond, we examine the prices of both round brilliant lab diamonds and fancy-shaped diamonds from six of the most affordable sites for purchasing lab-created diamonds.

Buying a diamond is a considerable investment, and it’s crucial to know how to choose the right stone and where to find the best deal. For this reason, we’ve created multiple tutorials to assist our readers in making informed choices.

The cheapest places to buy a 4-carat lab-grown diamond

We suggest starting by reading our buying guides below:

Understanding 4-carat lab diamond prices

To begin learning about diamonds, it’s essential to understand the 4Cs. Our recommendation is to start with our guide to lab-grown diamonds. However, if you’re in a hurry or only interested in the prices for 4-carat lab diamonds, you can certainly skip ahead.

The diamond 4Cs (for mined and lab diamonds) are:

If you need a fast lab diamond-buying refresher, remember these 3 things:

  • First, it’s crucial to understand that the main characteristic of diamonds is their brilliance, particularly for all brilliant cut diamonds. Though some fancy-shaped and fancy-colored diamonds, brilliance is not the most important factor, the diamond cut grade for all diamonds is still key. That’s why we always recommend prioritizing cut grade over diamond size when buying a lab-grown diamond.
  • So, it’s not the size that counts most when it comes to diamond quality. When deciding on the quality of a diamond, the 4Cs of diamond quality—cut, clarity, color, and carat—in that order, should all be prioritized. First, aim for the best cut possible, then color and clarity grades, and carat last.
  • Whenever feasible, select diamond weights that are slightly below the commonly sought-after sizes. Avoiding the round weights can result in significant cost savings. Nobody will be able to distinguish the difference. For instance, you can choose a 3.91-carat diamond instead of a diamond that weighs exactly 4.0 carats.

We have collected price information on 4-carat lab-created diamonds from the best online lab diamond vendors in 2023 to provide you with an estimate of their cost. Our benchmark diamond is a lab-created round brilliant-cut diamond with the following 4C grades:

While our benchmark diamond may not be the ideal fit for everyone, it provides a useful example of how to differentiate between the 4Cs of diamonds.

Average prices for 4-carat lab diamonds

We’ve compiled a list of prices for 4-carat lab-created diamonds from our preferred lab-grown diamond jewelers. These retailers are, in our view, the leading places to purchase lab-grown diamonds and the best choices for lab-created diamond engagement rings. They have the largest selection of top-quality diamonds, offer exceptional shopping experiences, and provide outstanding customer service. Moreover, they offer the most economical prices for lab-grown diamonds!

Lab diamond jewelerPrices for 4-carat lab diamonds
Clean Origin$3949-7044
With Clarity$4248-17209
Grown Brilliance$4340-6510
Brilliant Earth**$8140-21290*
James Allen**$15340-19460
Prices for 4-carat lab diamonds collected during September 2023.

Prices are accurate at the time of writing in 2023.
*Includes 100% sustainable diamonds.

**Note that Brilliant Earth and James Allen prices are for higher-quality diamonds because their minimum quality is higher than our reference minimums.

Average prices for fancy-shaped 4-carat lab diamonds

Lab-created diamonds come in various shapes and sizes, with the round brilliant-cut diamond being the most popular. However, numerous other shapes of lab-grown diamonds are available, known as fancy shapes or cuts, which are any shape other than round brilliant. As we explained in our guide to lab-grown diamond shapes, each shape has its own distinct beauty, benefits, and disadvantages.

Some lab-grown diamond shapes, like the heart-shaped diamond, are pricier than the round brilliant cut, whereas others, such as the emerald shape, are more affordable. We’ve compiled the average price of all 4-carat fancy-shaped lab-grown diamonds to help you compare the costs of the most popular fancy shapes.

As fancy-shaped diamonds are evaluated differently, and cut grading is less strict compared to round brilliants, we have adjusted the ranges below. Specifically, the cut rating now includes “very good,” which would not be acceptable for a brilliant round cut.

The following prices are starting prices and may increase with quality, but they provide an overview of the price range, and all diamonds will have at least the minimum specifications mentioned.

Lab diamond shapeOvalEmeraldPearPrincessRadiantCushionHeart
Clean Origin$3508$2879$4594$2912$2937$2597$7741
With Clarity$3686$3208$3295$3405$3305
Grown Brilliance$4685$6225$8325$5205$4060$5570
Brilliant Earth*$7690$8010$6670$7190$8080$7820$10180
James Allen*$13680$5980$13030$7320$16270$9640$15650
Prices for 4-carat lab diamonds collected during September 2023.

Prices are accurate at the time of writing in 2023.
*Cut grade fancy **Higher than minimum grades.

**Note that Brilliant Earth and James Allen prices are for higher-quality diamonds because their minimum quality is higher than our reference minimums.

The prices for 4-carat lab-grown diamonds are sourced from our top-rated places to purchase lab-grown diamonds, which offer the best quality, lowest prices, and most satisfying shopping experience.

Why choose a 4-carat lab-grown diamond?

Lab-grown diamonds can cost 60-80% less than mined diamonds with the same 4C grading. Additionally, lab-grown diamond deals can offer even more savings. Our team closely monitors the market and when diamond sellers announce special deals or discounts. Sign up below to receive notifications about new discounts on lab-grown diamonds.

In addition to being more affordable, lab-grown diamonds have other advantages over mined diamonds, including being more eco-friendly and socially responsible. You can learn more about these benefits by reading the following articles:

Sustainable 4-carat lab-grown diamonds

Brilliant Earth is one of the top places to buy lab-grown diamonds that are sustainable and offer zero-emission lab diamonds. We’ve reviewed Brilliant Earth and have awarded them a top rating! Vrai is another option, but we compared Brilliant Earth and Vrai and concluded that Brilliant Earth is the best choice for sustainable diamonds (see our Vrai review). Pandora Brilliance also prioritizes sustainability, as we highlighted in our Pandora Brilliance review, but they don’t quite match up to Vrai or Brilliant Earth.

Three 4-carat lab diamond ring examples

There are many options available for jewelry sets that feature a 4-carat lab-grown diamond. The rings displayed below showcase a 4-carat lab diamond in a variety of styles, ranging from classic to modern engagement ring settings. Whether you’re in the market for a lab-grown diamond engagement ring or a lab diamond anniversary ring, a 4-carat lab diamond is a great option.

4-carat lab diamond ring from Ritani

Hidden Accent Diamond Band Engagement Ring from Ritani

Emerald 4-carat lab diamond ring from Ritani

4-carat lab diamond ring from Grown Brilliance

Badgley Mischka Near-Colorless 4-carat Round Lab Grown Diamond Hidden Halo Engagement Ring

4-carat lab diamond ring from Grown Brilliance

4-carat lab diamond from James Allen

14K Rose Gold Petite Pavé Cathedral Engagement Ring from James Allen

4-carat lab diamond ring from James Allen

Where to buy 4-carat lab diamonds and jewelry

At, we provide reviews of sellers that offer lab-grown diamonds to aid you in your search for the perfect lab diamond and jewelry. We also offer comparisons of the best lab diamond jewelers if you are unable to decide. The following list provides our recommendations for the best places to purchase a 4-carat lab diamond based on factors such as pricing, inventory, quality, sustainability, and shopping experience.

Our recommended best places to buy a 4-carat lab diamond

Ritani review ⭐⭐⭐⭐⭐

Ritani tops our list of the best places to buy lab-grown diamonds because of their market-leading low prices and price transparency, the most extensive inventory of lab diamonds, customization options, and jewelry store partnership. That makes Ritani one of the best places to buy a 4-carat lab-grown diamond.

Ritani is one of the best places to buy a 4-carat lab-grown diamond.
Clean Origin is another of the best places to buy a 4-carat lab-created diamond.
Clean Origin review ⭐⭐⭐⭐⭐
Clean Origin

Clean Origin is another of our favorite places to buy a 4-carat lab diamond. We recommend Clean Origin for its unbeatable prices, a vast selection of lab-grown diamonds and jewelry, and excellent support (plus 100-day risk-free returns).

Brilliant Earth review ⭐⭐⭐⭐⭐
Brilliant Earth

Brilliant Earth is the leading sustainable lab-grown diamond jeweler. Their deep commitment to sustainability, including being the only seller of sustainable graded lab diamonds, sets them apart. See all their 4-carat lab diamonds below.

Brilliant Earth is one of the best places to buy a 4-carat lab-grown diamond.
James Allen is one of the best places to buy a 4-carat lab-created diamond.
James Allen review ⭐⭐⭐⭐⭐
James Allen

James Allen is one of our best-rated places to buy lab-grown diamonds overall and one of the best for premium 4-carat lab diamonds. Their service is top-notch, prices are low, and the quality and craftsmanship are superb.

Compare prices on other lab-grown diamond-carat weights

We have listed the prices of lab-grown diamonds for the most in-demand carat weights. You can compare the prices of 4-carat lab-grown diamonds with the carat weights listed below:

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Klaus T
Klaus T

Klaus is an ex-diplomat, economic development expert, ex-Googler, and start-up founder. He has 10+ years of expertise in economic development, trade and resource extraction, and he worked with the impact of mining on societies and the environment. He is an expert on how resources, such as gold and diamonds and diamond mining impact communities and exporting countries, and has worked with the UN, the World Bank, the African Union, the African Development Bank, and similar organizations. Klaus later shifted focus to work with data analysis, marketing technology, measurement, and analytics, including at 7+ years at Google.

Klaus developed a profound interest in diamonds, particularly lab-grown diamonds, and has worked with diamond and lab diamond analysis and valuation for many years on the side. Klaus is an expert in diamond prices and valuation, the investment side of diamonds, and the economic development impact of diamond mining.

At, Klaus is responsible for anything related to diamond analysis and valuations, the financial aspects of diamond buying, and the impact of diamond mining vs. creating diamonds in the laboratory.

Please get in touch with Klaus if you are looking for data and analysis related to lab-grown diamonds or if you have questions about the economic impact of diamond mining and the shift to creating diamonds in the laboratory.

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