Best Places to Buy Lab-Grown Diamonds Online in 2026

Our top five at a glance

After comparing prices, diamond selection, jewelry, inspection tools, service, and policies, these are the five jewelers we would start with in 2026:

Our first stop is Ritani. It had the lowest prices in our latest comparison by a wide margin, offers an enormous selection, and shows buyers how its prices are built. Blue Nile is the better fit if you are willing to pay more for a polished experience, excellent diamond inspection, and physical showrooms.

The other three are more specialized. We like Grown Brilliance for jewelry design, With Clarity for its ring builder and Home Preview, and Brilliant Earth for premium designs, showrooms, and selected lab-grown diamonds with clearer energy and sustainability attributes.

Read our Ritani review Visit Ritani

Which jeweler is right for you?

There is no single best jeweler for every purchase. A seller can have the cheapest loose diamond but not the setting you want. Another can offer excellent service and beautiful showrooms while charging much more for a comparable stone.

Use this short guide:

• Start with Ritani if price and loose-diamond choice matter most.
• Choose Blue Nile if you want the most polished all-round experience and the option to visit a showroom.
• Choose Grown Brilliance if the finished jewelry or setting is as important as the center diamond.
• Choose With Clarity if you want to build a ring, explore custom work, or try replica designs at home.
• Choose Brilliant Earth if you value distinctive design, in-person help, and its more specific sustainability options enough to pay a premium.

The scores are close because all five are strong sellers. Their prices and strengths are not close, which is why the best choice depends on what you are buying.

What our latest price test found

For our latest price comparison, we looked for round lab-grown diamonds close to two carats with E color, VVS2 clarity, IGI grading, and each seller's highest suitable cut label. The stones were comparable rather than identical, and prices change with inventory and promotions.

Ritani's result was the median of its five lowest close matches: $421, $422, $422, $422, and $422. We used the median so one unusually cheap listing would not decide the result.

This does not make the other four poor choices. It shows how much you may be paying for design, showrooms, service, brand experience, or a particular setting. Before ordering, compare the loose diamond separately from the complete ring.

See our full seven-seller price comparison

Detailed reviews of the best places to buy lab-grown diamonds

1. Ritani: best overall value

Ritani is the jeweler we would check first for a loose lab-grown diamond. It combines very low prices with a huge searchable inventory, strong filters, real media on many listings, and unusually clear price information.

We also bought a lab-grown diamond ring from Ritani. It arrived quickly, looked good, and was securely packaged with its IGI report. That matters because the recommendation is not based only on what the search page promises.

Ritani's cost breakdown is one of its best features. On the product page we checked, it showed the diamond cost, fulfillment cost, markup, and final price. Its setting selection is less distinctive than the ranges at Grown Brilliance or Brilliant Earth, but you can buy the loose stone at Ritani and compare settings elsewhere if needed.

What we like:

• The lowest prices in our 2026 comparison.
• A huge, easy-to-filter lab-grown diamond inventory.
• Clear cost and markup information.
• Useful diamond recommendations and an easy ring builder.
• A good result from our own test purchase.

What to know: Ritani's public return, delivery, warranty, and Diamond Pro pages do not always use the same terms. Confirm the rules that apply to your order before paying.

Best for: buyers who want the best chance of finding a low-priced loose lab-grown diamond and are comfortable comparing videos, reports, and measurements.

Read our full Ritani review Visit Ritani

2. Blue Nile: best all-round buying experience

Blue Nile is one of the best all-round diamond jewelers we have tested. We bought a 1.85-carat lab-grown diamond ring from the company, and the craftsmanship and finish exceeded our expectations.

The current site has a large lab-grown diamond selection, excellent 360-degree views, grading information, a smooth ring builder, helpful support, and physical showrooms. It is easier for a first-time buyer to inspect and compare diamonds here than at sellers that provide only a report and a basic video.

Blue Nile now also carries the James Allen collection. This is the right place to look if you liked James Allen's jewelry designs, but it is not a return of the old James Allen loose-diamond store.

The main drawback is price. Blue Nile's median in our latest comparison was $1,782, compared with $422 at Ritani. We would pay more for a setting we preferred or a buying experience that made us more confident, but not automatically for the loose diamond alone.

What we like:

• Excellent diamond images, specifications, and grading information.
• A polished online experience with showrooms and helpful support.
• A large loose-diamond and jewelry selection.
• Our purchased ring was beautifully made.
• Free US shipping, eligible 30-day returns, and a lifetime manufacturing warranty.

What to know: prices can be much higher than at Ritani, and the 30-day return period begins when the order ships rather than when it arrives.

Best for: buyers who want a long-established jeweler, strong inspection tools, showrooms, and a smooth overall purchase.

Read our full Blue Nile review Visit Blue Nile

3. Grown Brilliance: best for design and finished jewelry

Grown Brilliance remains one of our favorite places to shop for finished lab-grown diamond jewelry. We have bought and returned several pieces, including a pendant, an eternity ring, and a heart necklace. The designs, finish, packaging, and overall presentation stood out.

Its ring-design experience is also one of the strongest we have used. You can combine settings and center stones, see the ring from several angles, and go beyond the standard solitaire and halo choices found in many catalogs. The company also has designer collections, High Jewelry, boutiques, and virtual appointments.

It is not our choice for the cheapest loose diamond. The 2.05-carat sample in our latest comparison was $1,615. Its loose-diamond range also starts at higher color and clarity grades, which keeps the visible quality high but removes many lower-priced combinations.

What we like:

• Distinctive engagement rings, fine jewelry, and designer collections.
• Excellent customization and ring-design tools.
• Our purchased pieces were well made and beautifully presented.
• Useful loose-diamond filters, large images, and 360-degree videos.
• A growing boutique network with virtual appointments.

What to know: loose diamonds cost more than at Ritani, and the grading report was not directly linked on the product page we checked. High Jewelry and custom orders have stricter return terms.

Best for: shoppers who care about the complete ring or finished jewelry and want more design choice than a basic online setting catalog offers.

Read our full Grown Brilliance review Visit Grown Brilliance

4. With Clarity: best for building and previewing a ring

With Clarity is one of our favorite choices for a lab-grown diamond engagement ring. We bought a custom 1.11-carat ring, which arrived in 11 days and was beautifully finished. We also tested Home Preview and found it useful for judging a setting on the hand before committing to the real ring.

The original version of this guide described Home Preview as free. The current program charges $200 for each replica ring, allows up to two designs for seven days, and turns the payment into a gift card after the replicas are returned. It is still useful, but buyers should understand that it is no longer the same free trial.

With Clarity also has a strong ring builder, custom work, grading reports, diamond videos, a SoHo showroom, and a growing finished-jewelry range. Its loose-diamond prices have become less competitive: our latest sample cost $1,063, more than twice the Ritani median.

What we like:

• Our custom ring was excellent and arrived in 11 days.
• Home Preview makes it easier to compare ring styles.
• Strong ring customization and custom-design options.
• A large lab-grown diamond selection with videos and grading reports.
• Free insured shipping and eligible 30-day returns.

What to know: Home Preview now becomes store credit rather than a cash refund, and loose diamonds were much more expensive than Ritani in our latest check.

Best for: engagement-ring buyers who want to explore designs at home, customize the ring, and get a polished online experience.

Read our full With Clarity review Visit With Clarity

5. Brilliant Earth: best premium showroom option

Brilliant Earth combines distinctive jewelry, strong diamond inspection tools, 43 US showrooms as of September 2026, virtual appointments, and 24/7 support. Its buying experience is among the most polished in the category.

The company also gives buyers more specific sustainability choices than most competitors. Its Renewable Energy, Capture, and Sustainably Rated lab-grown diamond collections have clearer attributes than a general claim that every lab-grown diamond is automatically sustainable. These options do not apply to every stone, so check the exact listing.

The trade-off is price. Its two-carat sample was $2,100 in our latest comparison, almost five times the Ritani median. Brilliant Earth can still be the right choice for a setting, showroom appointment, or selected diamond that meets your preferences, but value shoppers should compare the stone elsewhere.

What we like:

• Excellent diamond search tools and real videos on many listings.
• Distinctive engagement rings and strong customization options.
• A large showroom network and easy access to support.
• More specific energy and sustainability choices than most sellers.
• Free shipping, eligible 30-day returns, and a lifetime manufacturing warranty.

What to know: prices can be much higher than at Ritani, some listings use sample images, and custom or altered orders have tighter return rules.

Best for: buyers who value premium design, in-person or virtual help, and stronger sustainability choices over the lowest possible price.

Read our full Brilliant Earth review Visit Brilliant Earth

What happened to James Allen?

James Allen was our top recommendation in earlier versions of this guide. We bought, returned, and exchanged jewelry there, and its diamond videos, expert help, and service were among the best we had tested.

The standalone James Allen store has now closed. Blue Nile carries the James Allen collection, but the old loose-diamond catalog, comparison tools, and standalone shopping experience are gone. That is why Blue Nile now appears in the top five and James Allen does not appear as an active seller.

Read the full James Allen update

How to save without choosing the wrong diamond

Compare the loose stone separately

Even if you prefer another jeweler's setting, compare a close loose diamond at Ritani. This shows how much of the final price comes from the stone and how much comes from the setting, service, or brand experience.

Put cut before invisible upgrades

Cut has the greatest effect on how a diamond handles light. Do not trade a lively, well-cut diamond for a higher clarity grade that you cannot see without magnification. For many buyers, G or H color and an eye-clean VS2 diamond offer better value than paying for D color and VVS clarity.

Inspect the actual diamond

The grading report is important, but it does not show everything. Look for a real high-resolution image or video of the stone. Check for tint, growth marks, haziness, and whether the diamond looks lively as it turns. If a seller only shows a generic image, ask for media of the actual diamond.

Read the return exclusions

A 30-day return policy may not cover a custom ring, an engraved item, a resized order, or certain premium collections. Also check when the clock starts. A return window that begins on the shipment date gives you less time at home than one that begins on delivery.

Look below popular carat marks

A diamond just under one, 1.5, or two carats can cost less and look almost the same size. Compare the millimeter measurements, not just the carat weight, because carat measures weight rather than visible diameter.

Why buy a lab-grown diamond?

Lab-grown diamonds are real diamonds with the same crystal structure and optical properties as mined diamonds. Their main advantage is price: buyers can usually afford a larger or higher-quality diamond for the same budget.

They also avoid diamond mining, but that does not make every lab-grown diamond equally sustainable. Energy source, production efficiency, cutting, metals, packaging, and shipping all matter. If environmental impact is important to you, look for specific information about the diamond rather than relying on the word “lab-grown” alone.

Lab-grown diamonds are generally a poor choice if future resale value is a priority. Buy the diamond for the jewelry and the years you expect to wear it, not as an investment.

Learn more about whether lab-grown diamonds are real

Lab-grown diamond engagement rings

For an engagement ring, judge the complete purchase rather than only the center stone. The setting, wedding-band fit, resizing policy, warranty, delivery timing, and return exclusions can matter as much as the diamond price.

Ritani is the place we would start for value. Grown Brilliance is stronger for distinctive settings and finished jewelry. With Clarity is particularly useful if you want to try replica designs or discuss custom work. Blue Nile and Brilliant Earth suit buyers who prefer a polished showroom-backed experience.

See our engagement-ring buying guide

How we chose these jewelers

This guide draws on the seller research we have carried out since starting LabGrownCarats in 2020. That includes purchases and returns, jewelry inspections, diamond and price comparisons, support tests, store visits, policy checks, and repeated updates to our individual reviews.

For the current ranking, we used the scores and findings from our 2026 reviews. We also compared close two-carat lab-grown diamonds across the five recommended sellers so that price remained part of the decision rather than a vague impression.

We considered:

• Loose-diamond prices and transparency.
• Diamond selection, filters, videos, and grading information.
• Jewelry design and customization.
• Our own purchase, return, and service experiences.
• Shipping, returns, resizing, and warranties.
• Showrooms, appointments, and support.
• Specific sustainability information rather than broad marketing claims.

This guide has been revised many times as sellers, prices, policies, and our own experience have changed. The September 2026 update replaces James Allen with Blue Nile, uses the scores from our newly reviewed core sellers, and incorporates our latest controlled price comparison.

Read our editorial and review process

Final verdict

Ritani is the best place to start for most buyers in 2026. It offers the strongest combination of low prices, selection, transparency, and a buying experience we have tested ourselves.

Blue Nile is our favorite all-round alternative if you are comfortable paying more. Grown Brilliance is the better design-led choice, With Clarity stands out for engagement-ring planning and custom work, and Brilliant Earth is the premium option for showrooms and more specific sustainability choices.

Open at least two sellers before deciding. Compare the loose diamond, then compare the setting and policies. The best purchase is not simply the cheapest listing or the highest score; it is the diamond and jeweler that fit the complete order.

Compare all jeweler reviews Visit Ritani