How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Lab grown diamonds are real diamonds, chemically and optically identical to mined diamonds, and typically cost far less for the same size and quality.
- Brilliant Earth leads on sustainability and showrooms, Blue Nile on selection and service, and Clean Origin on the longest return window at 100 days.
- Rare Carat stands out for comparison shopping, with AI price and quality scores across a catalog of more than 2 million certified stones.
- James Allen no longer operates as a standalone store: its collection now sits inside Blue Nile, so we list Blue Nile once rather than both names.
- Prices move fast in this category and vary by exact stone, so we list starting price as "See website" and give comparison benchmarks in the text where sources agree.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Brilliant Earth | Sustainability and showrooms | See website | No |
 Blue Nile | Selection and service | See website | No |
 Clean Origin | Longest return window | See website | No |
 Ritani | Transparent pricing and previews | See website | No |
 Vrai | Direct from foundry diamonds | See website | No |
 Grown Brilliance | Everyday luxury and fine jewelry | See website | No |
 With Clarity | Home try on and custom design | See website | No |
 Rare Carat | Comparison shopping | See website | No |
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We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
The best lab grown diamond companies
Starting priceSee website
Free planNo
Brilliant Earth, founded in 2005, remains the premium choice for buyers who value sustainability and in person service. Its lab grown diamonds are set in recycled precious metals, operations are carbon neutral, and diamond transparency is a core brand promise, with origin information available for stones.
With 42 plus showrooms across the US, buyers can see settings and stones in person before committing, and virtual appointments serve those without a nearby store. The company also offers custom cut lab grown diamonds and a 20 year record of diamond innovation.
Comparison benchmarks put a 1 carat D color, VVS clarity, excellent cut stone at around 770 dollars and above, and one loose diamond test found Brilliant Earth the most expensive seller at 2,100 dollars for its test stone. Buyers who prioritize price over showrooms should compare the same stone at Clean Origin or Ritani first.
What we like- 42 plus US showrooms
- Carbon neutral operations and recycled metals
- 60 day returns
- Custom cut lab grown diamonds
Watch out for- Prices run 10 to 20 percent above most competitors
- Premium positioning
- Lab diamond prices vary by stone
Starting priceSee website
Free planNo
Blue Nile is the classic online diamond retailer, with an expansive selection of IGI and GIA certified lab grown loose diamonds and classic engagement settings. Its inspection tools and established service earn it a 4.6 out of 5 rating in one 2026 loose diamond comparison, and physical showrooms now complement the online experience.
The former James Allen collection now lives inside Blue Nile after its parent company acquisition, which means the 360 degree viewing technology that made James Allen famous is effectively part of Blue Nile today. Buyers who arrive looking for James Allen should shop Blue Nile directly.
Blue Nile suits buyers who want the broadest choice with trusted service and are willing to pay a modest premium for it. Budget focused buyers should compare the exact loose diamond at Ritani before ordering.
What we like- Largest selection of certified lab grown diamonds
- Now includes the former James Allen collection
- Physical showrooms
- 30 day returns
Watch out for- Prices sit above budget sellers
- Loose diamond test middle price was 1,782 dollars
- Premium reflects overhead
Starting priceSee website
Free planNo
Clean Origin is a lab grown only specialist, which keeps its focus narrow and its pricing competitive: comparison benchmarks put a 1 carat D, VVS, excellent cut stone at around 512 dollars and above. Its 100 day return window is the longest in the industry, giving buyers unusual time to be sure.
The company explains lab grown diamonds plainly on its homepage: they are real diamonds with the same physical, chemical, and optical properties as mined diamonds, produced with technology that replicates natural formation, and conflict free. Buying guidance centers on the 4Cs of carat, color, clarity, and cut, graded by GIA and IGI.
Clean Origin fits budget conscious buyers who want a long return window and do not need a showroom. Buyers who want to see a ring in person should choose Brilliant Earth or Blue Nile.
What we like- 100 day return window, longest in the industry
- Lab grown only specialist
- IGI and GIA certification
- North America focused
Watch out for- Online only, no showrooms
- Smaller setting range than Brilliant Earth or Blue Nile
- Brand recognition is lower
Starting priceSee website
Free planNo
Ritani has crafted diamond jewelry since 1999, with rings handcrafted in its New York factory, and earns the highest loose diamond rating in one 2026 comparison at 4.7 out of 5 for low prices, selection, and detailed filters. Its Ring Studio allows full customization, and diamonds come in ten shapes in both natural and lab grown options, certified by GIA or IGI.
The standout feature is the free preview: on orders of 1,500 dollars or more, buyers can choose a nearby preview location, with a temporary hold placed on the card and no charge if they walk away. Financing through Affirm and Klarna is available, and a 30 day return policy applies.
Ritani suits buyers who want transparent pricing and a no risk in person look before paying. Buyers who want the longest return window should choose Clean Origin instead.
What we like- Transparent cost breakdown
- Free in person preview on orders of 1,500 dollars or more
- Ritani Reserve Ideal Cut standard
- Handcrafted in New York since 1999
Watch out for- 30 day returns only
- Preview requires a temporary card hold
- Smaller marketing presence than Blue Nile
Starting priceSee website
Free planNo
Vrai, from Diamond Foundry, grows its own diamonds rather than sourcing from third party growers, which gives it control over quality and a distinctive sustainability story. Its signature styles and custom made engagement rings are sold through global showrooms and online, with diamond experts available by phone and in person.
The foundry model appeals to buyers who care about provenance: a diamond grown by the company selling it, with a clear chain from creation to setting. Vrai styles tend toward modern, clean designs rather than the widest possible catalog.
Vrai fits buyers who want direct from foundry provenance and modern design. Price first buyers will find lower benchmarks at Clean Origin, Ritani, or Rare Carat.
What we like- Grows its own diamonds at its foundry
- Signature styles
- Global showrooms
- Diamond expert consultations
Watch out for- Prices sit above budget sellers
- Style range is more curated than mass market
- Foundry story matters less to price first buyers
Starting priceSee website
Free planNo
Grown Brilliance sells lab grown diamonds exclusively, from loose stones to engagement rings, wedding bands, earrings, and tennis bracelets, with free shipping, free returns, and a lifetime warranty on every purchase. Its diamonds span 0.90 to over 20 carats, in D to H color and FL to VS2 clarity, with Ideal and Excellent cuts.
The company uses an everyday best pricing model with no sales or markups, and a sliding budget tool covering 1,000 to 100,000 dollars. Sustainability claims include a mostly carbon neutral supply chain and jewelry crafted from 96 percent recycled gold in recyclable or biodegradable packaging.
Grown Brilliance suits buyers who want fine jewelry beyond engagement rings at transparent everyday prices. Buyers who want a showroom should look at Brilliant Earth or Blue Nile.
What we like- Lab grown only focus
- Free shipping and returns
- Lifetime warranty
- 96 percent recycled gold
- Prices from 1,000 to 100,000 dollars
Watch out for- Brand recognition is lower than Blue Nile
- No showroom network mentioned
- Everyday pricing model means fewer sale events
Starting priceSee website
Free planNo
With Clarity pairs custom ring design with a try before you buy program: buyers can try two rings at home, made as 3D printed, finely crafted custom replicas, with a complimentary consultation. Virtual or in person appointments at its SoHo showroom in New York support guided shopping.
The company covers engagement rings, anniversary rings, eternity rings, and fine jewelry, with a Clarity Commitment protection plan covering repairs, resizing, center stone repair, accent stone replacement, prong tightening, and polishing. Press coverage includes Vogue, Forbes, and People.
With Clarity fits buyers who want guided custom design and a home trial before committing. Buyers who want the lowest loose diamond price should compare at Ritani or Rare Carat first.
What we like- Try before you buy with two rings at home
- Custom and preset designs
- SoHo showroom and virtual appointments
- Clarity Commitment protection plan
Watch out for- Many homepage listings show as sold out during sale periods
- Pricing varies widely by design
- Smaller catalog than Blue Nile
Starting priceSee website
Free planNo
Rare Carat is a comparison marketplace rather than a single jeweler: it pulls certified lab grown diamonds from multiple sellers into one catalog of more than 2 million stones, scores each on price and quality with AI, and pairs the search with more than 100 gemologists on call. One 2026 retailer ranking rates it 5.0 out of 5 and puts its 1 carat benchmark at 410 to 600 dollars.
The company claims shoppers can save up to 44 percent by shopping with its price and quality scores, and it covers engagement rings, tennis bracelets, earrings, eternity bands, wedding rings, necklaces, and colored diamonds across all ten shapes.
Rare Carat fits buyers who want to compare many sellers at once and get gemologist guidance without visiting multiple sites. Buyers who want a single brand warranty and showroom should choose Brilliant Earth or Blue Nile.
What we like- AI price and quality scores across 2 million plus certified stones
- 100 plus gemologists on call
- Free insured shipping
- 5.0 out of 5 in one 2026 ranking
Watch out for- Marketplace model means fulfillment varies by seller
- 1 carat benchmark range is wide at 410 to 600 dollars
- Less own brand jewelry than Brilliant Earth
How we chose
We compared lab grown diamond companies by selection, certification, return policy, showroom or preview options, pricing benchmarks, and service quality. We opened every company homepage to confirm it loads and belongs to the company described, and we excluded James Allen as a standalone listing because its collection now sits inside Blue Nile. Prices vary by exact stone and move quickly in this category, so we list starting price as "See website" and cite comparison benchmarks in the text rather than presenting a single price as current. We weighted IGI and GIA certification, return windows, and independent comparison ratings over marketing claims.
What to check before you buy a lab grown diamond
First, prioritize cut over grades the eye cannot see. Cut has the greatest effect on how a diamond handles light, so start with a strong cut grade and sensible proportions, and do not give up a lively, well cut stone just to move from VS2 to VVS1 clarity when both look clean without magnification.
Next, open the independent grading report and match its number to the diamond. Every stone in this list should carry an IGI or GIA report: check carat, color, clarity, cut, and dimensions, and compare like for like stones across sellers, including the setting, taxes, return terms, and service.
Finally, treat a lab grown diamond as jewelry, not an investment. Lab grown prices have fallen as production has expanded, and resale value is weak, so buy the size and quality you will enjoy wearing rather than expecting the stone to hold its purchase price.
Frequently asked questions
Are lab grown diamonds real diamonds?
Yes. Lab grown diamonds have the same physical, chemical, and optical properties as mined diamonds and are recognized as genuine diamonds by the FTC. Only specialized equipment can detect the growth patterns that reveal origin.
How much cheaper are lab grown diamonds than mined diamonds?
Lab grown diamonds typically cost far less than mined diamonds of the same size and quality, with some sellers citing 50 to 60 percent savings. Exact savings vary by stone, and prices have fallen industry wide through 2025 and 2026.
Which certification should I look for?
IGI and GIA are the two most common independent labs for lab grown diamonds, and both grade on cut, color, clarity, and carat. Always match the report number to the stone you receive.
What happened to James Allen?
James Allen is no longer a standalone store. Its collection now sits inside Blue Nile after an acquisition by Blue Nile parent company, so shoppers should use Blue Nile for the same inventory and viewing tools.
Do lab grown diamonds hold their value?
Generally no. Lab grown diamonds have weak resale and trade in value, and retail prices have fallen as production expanded. Mined diamonds also resell below retail, but their secondary market is broader. Buy lab grown diamonds for wearing, not as an investment.
Sources we checked (10)
- https://www.brilliantearth.com
- https://www.bluenile.com
- https://www.cleanorigin.com
- https://www.ritani.com
- https://www.vrai.com
- https://www.grownbrilliance.com
- https://www.withclarity.com
- https://www.rarecarat.com
- https://www.madisondia.com/en/blogs/news/where-to-buy-lab-diamond-in-usa
- https://labgrowncarats.com/cheapest-places-to-buy-lab-grown-diamonds/
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.