Best Places to Buy Certified Lab Diamonds
A comprehensive guide to why Rare Carat is the best place to buy certified lab diamond in 2026
- Rare Carat offers certified lab-grown diamonds with grading reports from GIA, IGI, or GCAL.
- All diamonds undergo a two-step verification process, including laser inscription checks and UV fluorescence testing.
- Lab diamonds cost 60-85% less than natural stones with identical 4Cs quality, allowing for larger or better stones within budget.
- Advanced search filters, HD 360° imagery, and free guidance from 100+ GIA-certified gemologists ensure confident shopping.
- Buyer perks include 30-day returns, a lifetime warranty, and custom jewelry crafted in New York workshops.
Lab-created diamonds have emerged as the top preference for individuals who desire to have the sparkle and strength of the traditional diamond but still wish to fit this purchase into an expanded budget.
With the progress of technology, these diamonds have proven to be as beautiful and effective as the mined ones, and thus make an ideal selection for use in engagement rings, earrings, and other premium lab jewelry.
With more and more online retailers available, the search for a certified lab-created diamond from a reputable source is just as important as finding the actual diamond. After all, choosing the right retailer allows buyers to shop with full transparency, review certification reports easily, and compare diamonds that fit their budget.
The sections below will explore what the process of certification means for lab-grown diamonds and how Rare Carat, one of the best places to buy certified lab diamonds, can simplify the process of comparing and shopping with the utmost confidence.
1. What “Certified” Actually Means for Lab Diamonds
While shopping for a lab stone, you will often find the word “certified diamonds”. Certification simply means that the diamond has been professionally evaluated by a qualified gemological lab. The lab has examined the diamond and reported on its quality based on specific grading criteria.
This report is an unbiased report of the characteristics of the diamond. Instead of using physical appearance and word of mouth from the seller, it is possible to view a detailed report of the diamond’s characteristics, which includes the 4Cs.
Having a certification also makes it simpler to compare diamonds. While two diamonds may appear to be of equal quality at first glance, there may be slight variations in quality as indicated on their grading report that may affect appearance and cost. For this reason, most experienced buyers prefer to purchase diamonds that have been accompanied by a recognized grading report.
For a better understanding of what is included on most grading reports, check out the table below.
| Report Detail | What It Describes | Why Buyers Should Check It |
|---|---|---|
| Cut Grade | How well the diamond’s facets interact with light. | A better cut generally produces stronger brilliance and sparkle. |
| Color Grade | The amount of color present in the diamond, usually graded from D to Z. | Helps buyers understand how colorless or warm the diamond may appear. |
| Clarity Grade | Measures internal inclusions and surface blemishes. | Indicates how clean the diamond appears to the naked eye. |
| Carat Weight | The diamond’s weight, which is commonly associated with size. | Allows buyers to compare size and value between diamonds. |
| Certification Number | A unique identification number assigned by the grading laboratory. | Lets buyers verify the diamond report directly with the grading lab. |
Because these reports provide an unbiased overview of a diamond’s quality, certification has become one of the most important factors buyers consider when selecting a lab-grown diamond online.
At Rare Carat, all diamonds, whether lab or natural, will be certified, and the certification will come only from the top grading institutions of the industry, such as GIA, IGI, or GCAL. When shopping with us, finding high-quality, ethically sourced diamonds and properly evaluating them becomes well-informed and confident with all the certified stones available.
If you are interested in knowing more, check out our diamond certificate guide. You can also check out our free diamond certificate and report tool for further assistance.
2. Price Difference Between Certified Natural and Lab Stones
Both lab diamonds and natural diamonds are graded according to the same criteria. However, there is a price difference between the two. This provides a buyer with an opportunity to own a larger and/or better diamond for the price of a mined stone.
Typically, certified lab-grown diamonds cost 1/3 to 1/4 the price of certified mined diamonds in the same 4Cs specifications. This basic price difference between the two types is shown below for a clear idea:
| Diamond Type | Typical Price Range (1 Carat, VS1–VS2, G–H) | Key Differences |
|---|---|---|
| Natural Diamonds | $4,000 – $7,000+ | Formed naturally over billions of years beneath the earth’s surface and extracted through mining. |
| Lab-Created Diamonds | $800 – $2,500 | Created using advanced technology in a controlled lab environment while maintaining the same physical and optical properties. |
Please note: GIA reports are usually associated with natural diamonds due to their strict criteria in determining the quality of diamonds, whereas IGI is usually used to determine the quality of lab-created diamonds.
3. Two-Step Verification of Certified Diamonds for the Best Quality
A diamond certificate is used to authenticate or verify a diamond's quality, meaning evaluating the certificate data with the diamond's quality reveals if what the diamond claims about its worth and look is indeed true.
For each certified diamond available at Rare Carat, we perform a two-step verification process (all under camera) on behalf of our customers so that they can get started with the diamond search process without having to worry about the diamonds' quality.
We start with the inspection of the diamond's laser inscription. Using magnification ranging from 60x to 110x, the microscopic laser inscription on the girdle of the diamond and the certificate number are compared. In cases where the inscription is not clear or does not match, the stone is sent back to the lab for correction.
Next, we use professional-grade UV Fluorescence testing equipment to verify the gem's authenticity. These devices help us ensure that the gem is precisely what it is said to be. For rare types of diamonds like Type IIa, we may conduct further tests with a Yehuda machine or send it to GIA New York for confirmation.
Rare Carat is known for its uncompromising commitment to quality, and it goes beyond just procuring certified lab stones from reputable labs. Our two-step verification process is indeed the proof of this.
4. Seamless Selection of Certified Lab Diamonds
After the decision to buy a certified lab stone has been made, the next process involves narrowing down the choices. With thousands of lab-grown diamonds available online, one has to filter their choices based on certain factors that affect their appearance and cost.
For many buyers, the process of narrowing down their choices starts with the selection of the shape and carat weight of the diamond. They then use factors such as quality grades like cut, color, and clarity to ensure they buy the one that best suits their budget and aesthetics. Because certified diamonds come with grading reports based on the 4Cs parameters, it becomes much easier to compare stones with similar characteristics.
The table below illustrates some of the factors considered when narrowing down the choices for certified lab-created diamonds.
Common Filters Buyers Use When Searching for Certified Lab Diamonds
| Search Factor | Typical Buyer Preference | Why It Helps |
|---|---|---|
| Diamond Shape | Round, Oval, Cushion, Princess | Determines the overall look and style of the diamond. |
| Carat Weight | 1–2 carats | Helps buyers focus on diamonds within their desired size range. |
| Color Grade | D–H | Provides a near-colorless appearance while balancing value. |
| Clarity Grade | VS1 – SI1 | Often appears eye-clean while remaining budget-friendly. |
| Certification | IGI, GIA, GCAL | Confirms the diamond’s grading and authenticity. |
At Rare Carat, our advanced diamond search filters are designed according to the 4Cs grades, along with the most popular considerations: diamond shape and price. Our filters are designed specifically to ensure that the search results and comparison of the diamonds are done according to the customer's desired preferences and requirements every time.
5. Choosing the Right Lab Diamond Carat Weight at a Glance
The carat weight of a lab-created diamond is an essential factor that determines its visibility. It is one of the most common considerations when choosing a lab-created diamond. For this reason, here is a brief guide below that indicates how various carat weights are considered and applied when choosing these diamonds.
| Carat Weight | Typical Use | Why Buyers Choose It |
|---|---|---|
| 0.50 – 0.75 ct | Minimalist rings, stud earrings | Offers subtle sparkle while remaining budget-friendly. |
| 1.00 ct | Engagement rings | A classic size that balances visibility and value. |
| 1.50 – 2.00 ct | Statement engagement rings | Provides a noticeably larger appearance without becoming overly dramatic. |
| 2.50 – 3.00 ct | Luxury rings or pendants | Chosen by buyers who want a bold, eye-catching centerpiece. |
| 3.50 ct and above | High-end custom jewelry | Ideal for buyers seeking maximum size and visual impact. |
Shop by Lab Carats At Rare Carat
- 1 Carat Lab Grown Diamonds
- 2 Carat Lab Grown Diamonds
- 3 Carat Lab Grown Diamonds
- 4 Carat Lab Grown Diamonds
- 5 Carat Lab Grown Diamonds
- 6 Carat Lab Grown Diamonds
- 7 Carat Lab Grown Diamonds
- 8 Carat Lab Grown Diamonds
- 9 Carat Lab Grown Diamonds
- 10 Carat Lab Grown Diamonds
6. Transparent & Detailed View of the Entire Certified Diamond Collection
Rare Carat provides shoppers with a wide selection of certified lab-created diamonds that are available to shoppers in the United States. And, to ensure transparency, we further offer high-definition images and 360-degree videos of over one million diamonds in this collection.
These images and videos are taken using jewelry-grade cameras, and the buyer can view them in high definition. The images are not edited in any way, and the buyer can view all the features of the diamond, such as the clarity and the reflection of light on the diamond.
This enables the buyer to view the diamond from various sides, giving him or her a clear idea of how the diamond looks before making the purchase. With the use of high-quality images, Rare Carat aims to provide the buyer with the actual feeling of seeing the diamond in person, thereby allowing the buyer to have enough confidence to view each and every diamond before making the purchase.
7. Free, Expert Guidance at Every Step
Even with the clearest image and ample help from our advanced diamond filters and recommendation engine, lab diamond buyers, especially first-time buyers, can face difficulties in understanding the true worth of their selected diamonds.
For this reason, we have a team of over 100 GIA-certified gemologists ready to provide the unfiltered, expert advice anytime you need it, and that ensures a seamless and successful shopping experience. Their main goal is to educate and guide, and that’s why understanding the flaws and strong points of each selected diamond, even the ones you have seen somewhere else, is always rewarding with us.
8. Buying Certified Lab Diamonds for Different Jewelry Types
Lab-grown diamonds vary in terms of their sizes and shapes, making them easily adaptable to the various types of jewelry. This enables the consumer to choose the best one for the intended jewelry.
The table below illustrates the most common types of jewelry with lab diamonds and the sizes of the diamonds used for each type of jewelry:
Popular Jewelry Pieces Using Lab Diamonds
| Jewelry Type | Typical Diamond Size | Why Buyers Choose It |
|---|---|---|
| Engagement Rings | 1 – 2 carats | Often selected as the centerpiece jewelry piece where brilliance and visual impact matter the most. |
| Diamond Earrings | 0.50 – 1 carat per stone | Popular for everyday wear, offering noticeable sparkle while remaining elegant and comfortable. |
| Bracelets | Multiple small diamonds | Creates a continuous line of brilliance, especially in classic tennis bracelet designs. |
| Pendants | 0.50 – 1.25 carats | Highlights a single diamond in a minimalist design that works well for daily wear. |
| Necklaces | 1 – 3 carats total weight | Chosen for elegant statement pieces that showcase multiple diamonds or decorative settings. |
| Lab Diamond Wedding Bands & Rings | 0.25 – 1 carat total weight | Designed to complement engagement rings or serve as elegant standalone bands. |
How to Find Lab Stud Earrings
Stud lab earrings, especially solitaire studs, are widely popular as one of the most popular jewelry pieces preferred with lab diamonds. These elegant, timeless design is usually meant for daily wear, and with lab alternatives (share the same hardness and durability level as mined), finding an affordable beauty is easy.
At Rare Carat, not only can you explore different diamond shapes or carat weights for these earring styles, but you will also see easy customization options for the setting metal as well, such as yellow gold, white gold, rose gold earrings.
How to Find Lab Engagement Rings
One of the most popular engagement ring styles also happens to be the solitaire design. It's a stunning piece that highlights a single diamond, meant to be a memorable purchase. With lab alternatives, engagement diamond ring shoppers have the option to explore more designs that would have been out of budget if natural stones were considered.
At Rare Carat, you are given the option to choose the diamond first and then select the setting of your choice, and your options include:
- Solitaire Ring Settings
- Halo Ring Settings
- Hidden Halo Ring Settings
- Pavé Lab Ring Settings
- Three-Stone Ring Settings
- Cathedral Ring Settings
- Bezel-Set Ring Settings
How to Find Lab Diamond Pendants
Just like solitaire stud earrings and rings, solitaire pendants are also one of the most popular jewlery style that are considered with lab alternatives instead of natural diamonds. They are often selected for gift, including self-gifting, to celebrate a special moment, because it offers the most flexibility. Just with a simple design change, a piece can become truly yours, one that fits your style and personality perfectly.
For example, a round lab pendant is already known for its classic look, but by changing the diamond shape to something more vintage-inspired, like cushion or oval, you can add an heirloom feel and truly make it a pendant timeless (antique-style).
No matter the jewelry type you have selected for the diamond, with Rare Carat, each piece will be handcrafted with care and precision in our advanced New York and New Jersey workshops, because we do not believe in mass production.
9. Protected Lab-Created Diamond Shopping Experience
A brief look into our various customer-centric services and practices can give you an idea of why we are Trustpilot’s highest-rated online jeweler in the US, boasting a perfect 5.0/5.0 rating based on over 3,000 verified reviews.
Our 100% money-back guarantee and free 30-day return policy are designed to help you find a lab-created diamond that you are completely satisfied with. Furthermore, our free insured shipping and other customer-centric perks, such as our lifetime warranty on all diamonds and jewelry, are designed to ensure that you are making informed and confident decisions every time you shop with us.
10. Why Rare Carat Is Your Best Place to Buy Certified Lab Diamonds
To provide an understanding of how Rare Carat can assist consumers during the purchase of a lab-created diamond, the table below has been provided to highlight some of the benefits of purchasing a certified lab-created diamond through Rare Carat.
Key Benefits of Buying Certified Lab Diamonds at Rare Carat
| Feature | How It Helps Buyers | Why It Matters |
|---|---|---|
| Certified Diamond Inventory | All lab diamonds come with trusted grading reports from IGI, GIA, or GCAL. | Ensures transparency and allows buyers to verify quality before purchasing. |
| Large Diamond Selection | Access to over one million diamonds from verified suppliers. | Provides more flexibility when comparing carat weight, shape, and price. |
| Two-Step Verification | Laser inscription checks and advanced testing equipment confirm diamond authenticity. | Adds an additional layer of quality assurance beyond certification. |
| HD Images & 360° Videos | High-definition imagery allows buyers to view each diamond from every angle. | Helps replicate the experience of examining the diamond in person. |
| Expert Gemologist Guidance | Over 100 GIA-certified gemologists provide free consultation. | Helps buyers confidently evaluate diamonds before purchasing. |
| Buyer Protection Policies | 30-day returns, insured shipping, and lifetime warranty. | Provides peace of mind when purchasing high-value jewelry online. |
When purchasing a certified lab-created diamond, it is not only a matter of purchasing a gemstone but also one of clarity, trust, and expert advice during the purchase. Rare Carat is dedicated to providing this clarity by providing transparent pricing, verification, and expert advice all at one location.
Rather than going from store to store and trying to compare lab-created diamonds on one’s own, Rare Carat provides an extensive selection of certified lab-created diamonds to choose from. This makes Rare Carat one of the most convenient online resources available to consumers who wish to purchase certified lab-created diamonds online.
Shop by Shape
- Round Lab Stones
- Asscher Lab Stones
- Heart Lab Stones
- Marquise Lab Stones
- Oval Lab Stones
- Radiant Lab Stones
- Emerald Lab Stones
- Cushion Lab Stones
- Pear Lab Stones
- Princess Lab Stones
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