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- Understanding Diamond Price and Quality
- December 2025 6-Carat Lab-Grown Diamond Prices
- Fancy-Shaped Lab Diamond Prices
- Why Choose a Lab-Grown Diamond?
- How To Save On A 6-Carat Diamond
- Three 6-Carat Lab Diamond Ring Examples
- Where To Buy Lab-Grown Diamonds and Jewelry
- Compare prices on other lab-grown diamond-carat weights
Welcome to our complete guide to 6-carat lab-grown diamond prices. In the following, we will walk you through what a 6-carat diamond is, how big they really are, where to buy them, and what jewelry such a large stone can be set in. We will compare prices from the cheapest places to purchase lab-grown diamonds, so you know where to get the best deal.
How much is a six-carat lab-created diamond? Well, the prices of diamonds vary greatly depending on grades and where they are purchased. Lab-created diamonds weighing 6 carats can range from $6,000 to $40,000, depending on their 4Cs (carat weight, cut, color, and clarity) and rarity.
On average, an excellent quality 6-carat lab-grown diamond costs around $7,500-9,000 in December 2025. That is up to 91% less than a mined equivalent of the exact same quality! Prices range from $6,000 to $40,000, depending on the stone’s quality.
Cheapest places to buy a 6-carat lab-grown diamond
Investing in a diamond is a significant decision, and it’s crucial to make an informed choice by carefully selecting the right stone and finding the best diamond deal. To help you with this, we have developed several guides that offer valuable tips and suggestions.
Start your research by exploring our buying guides listed below:
- Guide to buying a lab-grown diamond—top saving tips
- How to buy a lab-grown diamond engagement ring online
- How to save money on a lab-grown diamond engagement ring
SALES ALERT! See the best diamond deals (terms apply):
Understanding Diamond Price and Quality
Beginning your diamond education starts with understanding the diamond 4Cs. Our guide to buying lab-grown diamonds is a great place to begin, but if you’re short on time or solely interested in finding the best prices, feel free to skip ahead.
The 4Cs of diamonds, which apply to both mined and lab-grown diamonds, are:
- Lab diamond cut
- Lab diamond clarity
- Lab diamond color
- Lad diamond carat
If you need a quick refresher on lab-created diamonds, keep these three things in mind:
- Brilliance is the most crucial feature of diamonds, especially for brilliant-cut diamonds. Although it may not be as critical for some fancy-shaped and fancy-colored lab diamonds, the diamond’s cut grade is still influential, so prioritize cut higher than size when purchasing a lab-grown diamond.
- As noted, size is not the most crucial factor when assessing a diamond’s quality. Instead, prioritize the 4Cs of diamond quality in this order: cut, clarity, color, and carat. Look for the highest quality cut first, followed by color and clarity grades, with carat weight being the least important.
- Opt for diamond weights slightly below the commonly sought-after sizes whenever possible. Avoiding round weights can result in significant cost savings without any noticeable difference. For example, you can choose a 4.89-carat diamond instead of a precisely 6.0-carat diamond.
We have compiled price information for 6-carat lab-created diamonds from the best online lab diamond sellers in 2024 to give you an estimate of their cost. Our example diamond is a lab-created round brilliant-cut diamond with the following 4C grades:
- Carat weight: 6.0 (plus-minus a little)
- Cut grade: Excellent (GIA) or Ideal (IGI)
- Color grade: I-J
- Clarity grade: VS1-VS2
- Shape: Round Brilliant
- Origin: Lab-grown
While our example diamond may not be perfect for everyone, the prices provide a reasonable idea of prices and how to differentiate between the 4C attributes of lab diamonds.
December 2025 6-Carat Lab-Grown Diamond Prices
We have compiled a list of diamond prices from our recommended lab-grown diamond retailers. These jewelers are, in our opinion, the best places to buy lab-grown diamonds and are also the best places to buy lab-created diamond engagement rings. And they are the cheapest, too.
They have vast collections of high-quality diamonds, fantastic shopping experiences, and outstanding customer service. Additionally, they provide the most competitive prices for lab-grown diamonds.
| Lab diamond jeweler | 6-carat lab diamond prices |
|---|---|
| Ritani | $5655-15914 |
| Clean Origin | $7342-14372 |
| Grown Brilliance | $6060-13145 |
| Brilliant Earth | $17270-34990* ** |
| James Allen | $19520-34610** |
Prices are accurate at the time of writing in 2025.
*Includes 100% sustainable diamonds.
**Note that Brilliant Earth’s and James Allen’s prices are higher because their minimum quality is higher than our reference minimums.
Fancy-Shaped Lab Diamond Prices
Lab-grown diamonds come in various shapes and sizes, with the round brilliant cut being the most popular. However, there are also many other shapes of lab-created diamonds, collectively called fancy shapes, which include any shape other than the round brilliant. Our lab-grown diamond shapes guide explains how each shape has unique beauty, advantages, and disadvantages.
While some lab-grown diamond shapes, like the heart shape, may be more expensive than the round brilliant cut, others, such as the emerald shape, can be more affordable. To help you compare the costs of the most popular fancy shapes, we have compiled the average price of all 6-carat fancy-shaped lab-grown diamonds.
How We Compared Prices for Fancy-Shaped Lab Diamonds
We have adjusted the ranges below as fancy-shaped diamonds are evaluated differently and have less strict cut grading than round brilliants. Specifically, the cut rating now includes “very good,” which would not be acceptable for a brilliant round cut.
- Carat weight: 6.0 (plus-minus a little)
- Cut grade: Very Good, Excellent, or Ideal (usually not independently graded)
- Color grade: I-J
- Clarity grade: VS1-VS2
- Shape: Fancy-shapes
- Origin: Lab-grown
December 2025 Fancy-Shaped 6-Carat Lab-Grown Diamond Prices
Note that the prices below are starting prices and will go up as quality increases. However, the prices indicate the price range; all diamonds will have at least the specifications listed.
Prices are accurate at the time of writing in 2025.
*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.
We have collected prices from our recommended lab-grown diamond jewelers, who all provide the highest quality, most affordable prices, and incredible shopping experiences.
Why Choose a Lab-Grown Diamond?
First and foremost, according to our comparison of lab-grown vs. natural diamond prices, lab diamonds are up to 60-80% lower with the same 4C gradings (quality).
But lab-grown diamonds offer many advantages over mined diamonds. Apart from being more affordable, they are also more eco-friendly and socially responsible. You can learn more insight about these by reading our following articles:
- Why lab-grown diamonds are the more sustainable, environmentally, and ethical diamond choice
- What you should know before buying a lab-grown diamond
How To Save On A 6-Carat Diamond
First, as noted above, choose a lab-grown diamond over a mined one. You’re already saving a ton by choosing an ethically and environmentally friendly diamond.
But diamond jewelers also run sales from time to time. Our team consistently monitors the market to identify when diamond vendors offer special deals or discounts. Enter your email below to be alerted of new lab-grown diamond sales.
Three 6-Carat Lab Diamond Ring Examples
While 6-carat lab-grown diamonds are relatively rare, it is still possible to find jewelry pieces featuring these stunning stones. By searching for or customizing your jewelry, you can purchase a jewelry piece featuring a 6-carat stone.
A 6-carat is a big gemstone, and a diamond of that size works best for engagement rings and rings in general. You can also set them in a pendant, for example, a necklace. A solitaire or a similar simple piece would be the best fit.
Where To Buy Lab-Grown Diamonds and Jewelry
At LabGrownCarats.com, we post reviews of lab-grown diamond jewelers to make it easier for you to find the perfect lab diamond or lab diamond jewelry. We also publish comparisons of the best lab diamond jewelers, should you be unable to decide. The list below shows our recommendations for the best places to purchase lab-created diamonds based on price, selection, quality, sustainability, and buying experience.
Our recommended best places to buy a 6-carat lab diamond
Ritani review ⭐⭐⭐⭐⭐
Ritani
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 6-carat lab-grown diamond.
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 6-carat lab diamonds below.
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 6-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 with the carat weights listed below:
- Prices for a ½-carat lab diamond
- Prices for a 3/4-carat lab diamond
- Prices for a 1-carat lab diamond
- Prices for a 1.5-carat lab diamond
- Prices for a 2-carat lab diamond
- Prices for a 3-carat lab diamond
- Prices for a 4-carat lab diamond
- Prices for a 5-carat lab diamond
- Prices for a lab diamond engagement ring
- Prices for lab diamond earrings
- Prices for synthetic diamonds
