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- Guide to Buying a Lab-Grown Diamond
- How We Researched Diamond Prices
- December 2025 3-Carat Lab-Grown Diamond Prices
- Fancy-Shaped Lab Diamond Prices
- December 2025 Fancy-Shaped 3-Carat Lab-Grown Diamond Prices
- Why choose a lab-grown diamond?
- Prices for sustainable lab-created diamonds
- Two 3-Carat Lab Diamond Jewelry Ideas
- Where to Buy Lab-Grown Diamonds
- Compare Other Lab-Grown Diamond Prices
Welcome to our complete guide to 3-carat lab-grown diamond prices. Our guide will provide you with all the information you need to know about 3-carat diamonds, including their size and how to get the most value out of them. We’ll also discuss the differences between lab-grown and mined diamonds.
We will help you choose the best 3-carat lab diamond while also helping you save money. We’ll compare prices for round brilliant and the most popular fancy-shaped 3-carat diamonds, highlighting the cheapest places to buy lab-grown diamonds. Finally, we’ll conclude our guide with our top recommended places to purchase lab-grown diamonds.
The prices for lab diamonds can vary widely depending on their grade and place of purchase. 3-carat lab diamond prices range from $1,700 to $16,000, depending on its rarity and diamond 4Cs.
3-carat lab diamond prices range from $1,700 to $16,000, depending on the quality and where you buy it. An excellent quality 3-carat lab-grown diamond costs between $2,500 and $2,800 in December 2025.
The cheapest places to buy lab-grown diamonds
SALES ALERT! See the best diamond deals (terms apply):
Guide to Buying a Lab-Grown Diamond
Purchasing a diamond is a significant investment, and it’s crucial to understand how to choose the best stone and where to get the most bang for your buck when purchasing a diamond. To assist our readers, we’ve put together a variety of tutorials.
- Guide to Buying a Lab-Grown Diamond – Top Tips to Saving and Getting a Better Diamond!
- How to Buy a Lab-Grown Diamond Engagement Ring Online
- 10 Tips to Save Money on a Lab-Grown Diamond Engagement Ring
Understanding the 4Cs of diamonds is essential when comparing diamond prices. You can skip ahead if you’re short on time or want to know the prices. The 4Cs of diamonds are:
In short, the (lab) diamond 4Cs are:
- Diamond cut
- Diamond clarity
- Diamond color
- Diamond carat
If you need a quick diamond-buying refresher, keep these three things in mind:
- First, when buying a diamond, remember that brilliance is the most crucial factor, especially with brilliant cut diamonds. While some fancy-shaped and fancy-colored diamonds don’t sparkle in the same way and diamond cut is less important, you should prioritize diamond cut grade higher than size.
- Size isn’t the most critical aspect of diamond quality. The 4Cs should be considered in order of importance: cut, clarity, color, and carat weight. With fancy-colored lab diamonds, color is more critical, but carat weight is still the last thing you should worry about.
- Going just below popular weights, such as selecting a 2.94-carat lab diamond instead of a 3.0-carat lab-created diamond, can save you money, and the difference isn’t noticeable.
How We Researched Diamond Prices
We’ve compiled 2024 prices for 3-carat lab-grown diamonds from the best online diamond retailers. Our reference diamond, a round brilliant-cut lab-grown diamond, has the following 4C grades.
- Carat weight: 3.0 (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 the perfect diamond for you may have other grades, you can still use this as a starting point to prioritize between the diamond 4Cs. For more information, read our introduction to lab-grown diamonds.
Not only do they offer a wide variety of high-quality diamonds, but they also provide exceptional shopping experiences and customer service. Additionally, and importantly, they offer the most reasonably priced lab-grown diamonds.
December 2025 3-Carat Lab-Grown Diamond Prices
| Lab diamond jeweler | Price for a 3-carat lab diamond |
|---|---|
| With Clarity | $2187-6086 |
| Ritani | $2338-4937 |
| Clean Origin | $2680-6572 |
| Grown Brilliance | $2655-4610 |
| James Allen | $4670-13460 |
| Brilliant Earth | $4780-16200* |
Prices are accurate at the time of writing in 2025.
*Includes 100% sustainable diamonds.
Fancy-Shaped Lab Diamond Prices
Laboratory-created diamonds are available in various sizes and shapes. Although the round brilliant-cut diamond is the most common and sought-after, numerous other shapes of lab diamonds are available. Shapes other than round brilliant are called fancy cuts or shapes. As we discuss in our guide to lab diamond shapes, each has its distinct beauty, benefits, and drawbacks.
Some shapes, such as heart-shaped lab diamonds, are more expensive than round brilliant, while others, such as princess-shaped ones, can be less expensive. To assist you in comparing the prices of the most popular fancy-shaped lab diamonds, we have researched the prices of 3-carat fancy-shaped lab diamonds.
How We Researched Fancy-Shaped Lab Diamond Prices
We have adjusted the ranges below since fancy-shaped diamonds are evaluated somewhat differently, and cut grading is less strict than for round brilliants. Notably, the cut rating includes very good, which we would never recommend for a round brilliant cut.
- Carat weight: 3.0 (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
All the prices we list below are starting and will go higher depending on the specific diamond quality. But the prices give you an idea of the expected price ranges at each lab diamond jeweler.
December 2025 Fancy-Shaped 3-Carat Lab-Grown Diamond Prices
| Lab diamond jeweler | Oval | Emerald | Pear | Princess | Radiant | Cushion | Heart |
|---|---|---|---|---|---|---|---|
| Ritani | $2018 | $1429 | $2528 | $1597 | $1839 | $1614 | $2047 |
| Clean Origin* | $2856 | $2249 | $3124 | $2802 | $2952 | $2894 | $3592 |
| With Clarity | $2562 | $2018 | — | $2280 | $2283 | $2200 | — |
| Grown Brilliance | $2610 | $2510 | $3410 | $2885 | $2540 | $2840 | $3090 |
| Brilliant Earth** | $5170 | $4630 | $4830 | $4600 | $4880 | $4920 | $5770 |
| James Allen** | $6070 | $4990 | $5830 | $4070 | $4710 | $4550 | $7090 |
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 since their minimum quality exceeds our above reference range.
Why choose a lab-grown diamond?
The most obvious reason for choosing a lab-grown diamond is that it can cost up to 91% less than mined diamonds with the exact same diamond grades. And you may be able to save even more money on lab-grown diamonds with deals or promotions.
We keep a close eye on the market and are usually the first to learn of any deals or discounts diamond retailers offer. Subscribe below to receive notifications of new discounts on lab-grown diamonds.
But just as importantly, in addition to being cheaper than mined diamonds, they also have other advantages, such as being more eco-friendly and having a more positive impact on society. If you want to learn more about these benefits, we recommend reading our articles:
- Why choose lab-grown diamonds for their sustainability and ethical advantages
- Things to consider before purchasing a lab-grown diamond
Prices for sustainable lab-created diamonds
Lab-grown diamonds are a great choice if you’re looking for ethical and sustainable options. For 100% sustainability, consider lab-grown diamonds created using renewable energy and set in recycled metal, with packaging made from sustainable materials. It’s important to note that prices for sustainable lab diamonds are around 30-40% higher than other lab-grown diamonds.
For those purchasing sustainable and zero-emission lab-grown diamonds, we recommend checking out Brilliant Earth (see our Brilliant Earth review) as one of the best options. Another possibility is Vrai, but after comparing Brilliant Earth and Vrai (see our Vrai review), we found that Brilliant Earth was the superior choice for sustainable diamonds. Pandora is a jewelry brand focusing on sustainability, but we rated Pandora lower.
Two 3-Carat Lab Diamond Jewelry Ideas
Many styles are available when searching for a jewelry set containing three-carat diamonds. The collection of rings displayed below showcases popular ring styles, with options ranging from conventional to modern engagement ring designs. Opting for a 3-carat stone is an excellent decision for a lab-grown diamond engagement ring, a lab diamond anniversary ring, or a pendant. However, other jewelry types are often unfit for such a large diamond.
Where to Buy Lab-Grown Diamonds
Our goal at LabGrownCarats.com is to assist you in finding the ideal lab-grown diamonds and jewelry by reviewing lab diamond vendors. We also compare the best lab diamond jewelry retailers.
We have compiled a list of our recommended retailers for purchasing lab diamonds, considering factors such as pricing, inventory, quality, sustainability, and overall shopping experience.
Our recommended places to buy a 3-carat lab-grown diamond
Ritani review ⭐⭐⭐⭐⭐
Ritani
Ritani tops our list of the cheapest places to buy lab-grown diamonds because of their market-leading low prices and price transparency, the largest inventory of lab diamonds, customization options, and jewelry store partnership. That makes Ritani one of the best places to buy lab-grown diamonds.
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 3-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 lab diamonds. Their service is top-notch, prices are low, and the quality and craftsmanship are superb.
Compare Other Lab-Grown Diamond Prices
We compile and list prices for the most popular lab-grown diamond carat weights. Compare the prices for 3-carat lab-grown diamonds with the below carat weights.
- 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 4-carat lab diamond
- Prices for a 5-carat lab diamond
- Prices for a 6-carat lab diamond
- Prices for a lab diamond engagement ring
- Prices for lab diamond earrings
