The jewelry industry is undergoing rapid transformation, and lab-grown diamonds are leading this change. Today’s buyers demand ethically sourced, sustainable, and competitively priced diamonds that do not compromise on quality or brilliance. Nowhere is this demand more evident than in New York City, home to some of the world’s most recognized diamond manufacturers and retailers.
In this blog, we look at the best lab-grown diamond manufacturers in NYC and why each one deserves your attention. Whether you’re sourcing loose stones, seeking specialty cuts, or building a private-label jewelry line, these companies represent some of the finest options available in the U.S. market.
1. Solitaire Lab Diamond
Solitaire Lab Diamond has quickly built a reputation as one of NYC’s top names in lab-grown diamonds. They focus exclusively on lab-grown stones, offering a wide inventory of IGI- and GIA-certified diamonds in multiple shapes and carat sizes. Retailers appreciate their transparent pricing structure, eco-conscious production, and fast delivery timelines.
Why Consider Them:
- Extensive selection of Type IIa lab-grown diamonds across shapes and carat sizes.
- Transparency and eco-consciousness, with process transparency and eco-friendly business practices; participates in carbon neutrality initiatives.
- Fast and reliable delivery for high-volume or premium-quality retail needs.
- Recognized certifications - majority of diamonds IGI/GIA certified; select stones GCAL certified.
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2. Classic Grown Diamonds (Shashvat Diamonds)
Classic Grown Diamonds is a wholesale leader with a specialty in IGI-certified loose stones and custom-cut solutions. Known for their large inventory and reliability, they are ideal for jewelers who want a consistent supply at scale.
Why Consider Them:
- Large and diverse inventory including fancy shapes and fancy colors.
- Competitive wholesale capability with support for bulk orders at scale.
- Reliability and consistency with longstanding supply relationships.
- All diamonds IGI certified, and select lots are GIA or GCAL certified for extra confidence.
3. ALTR Created Diamonds
A true pioneer in the lab-grown diamond space, ALTR is a vertically integrated diamond manufacturer known for producing high-purity Type IIa diamonds. Their innovation and patented processes make them a reliable source for retailers who need precision and exceptional brilliance.
Why Consider Them:
- Industry innovation with patented lab-grown diamond technologies.
- High-clarity production focused on colorless (D–F), VS2+ stones.
- Retail partnership support, including private-label and branding services.
- Pursues sustainability certifications and often a finalist in jewelry innovation awards.
4. Surreal Diamond
Surreal Diamond is one of the world’s largest CVD diamond producers, with an NYC presence for wholesale buyers. Their emphasis on technology and scalability makes them a go-to option for jewelers requiring bulk orders with consistent specifications.
Why Consider Them:
- Bulk CVD production that ensures consistent quality at scale.
- Attractive pricing for larger carat stones and high-purity options.
- Technological excellence through ongoing process improvements.
- Certified diamonds - predominantly IGI; company commits to annual third-party sustainability audits.
5. With Clarity
Known for its consumer-friendly approach and advanced try-at-home ring replica program, With Clarity is also a solid source for lab-grown diamonds and finished jewelry. While they focus more on B2C, retail buyers value their product consistency and customization services.
Why Consider Them:
- Modern shopping experience with virtual try-at-home ring replicas.
- Wide product range - loose stones and finished engagement rings.
- Customization services for retail buyers.
- IGI-certification on all lab-grown diamonds; company has been recognized for digital innovation in jewelry retail.
6. Stienhardt & Stones
Stienhardt & Stones caters to buyers looking for high-end, custom-designed jewelry using lab-grown diamonds. Their attention to detail and excellent design support make them an attractive partner for retail brands that emphasize unique jewelry collections.
Why Consider Them:
- Specialized in high-end custom pieces and private-label jewelry.
- Personalized service with attention to detail for unique projects.
- Environmentally responsible - pursues recycled metal use and sustainability pledges.
- All stones certified by IGI; has received local awards for customer satisfaction in design.
7. Daniela Diamonds
Located in the heart of NYC’s famous Diamond District, Daniela Diamonds has earned praise for its ethical sourcing and fair pricing. Retail jewelers like their range of lab-grown loose stones and finished jewelry, along with the option for custom engagement rings.
Why Consider Them:
- Strong Diamond District reputation among retail and wholesale buyers.
- Versatile inventory including finished pieces and loose diamonds.
- Competitive pricing with upfront disclosure.
- IGI and GIA certifications standard; participating in NYC’s sustainable jewelry initiatives.
8. Michael Gabriels
Michael Gabriels focuses on accessible luxury jewelry with lab-grown diamonds at its core. Their IGI-certified stones and fine craftsmanship appeal to smaller retailers seeking high-quality yet affordable designs.
Why Consider Them:
- Balance of affordability and elegance in every piece.
- Flexible order sizes supporting retailers of all scales.
- Certified stones - majority IGI, select stones with GCAL certification.
- Eco-conscious mission - committed to minimizing carbon footprint.
9. Ultimate Diamond
Ultimate Diamond has a solid reputation for personalized service and a well-curated lab-grown diamond inventory. They are often recommended by industry insiders for their excellent customer support and fair pricing policies.
Why Consider Them:
- Highly rated for customer experience and transparent, efficient transactions.
- Local inventory for expedited orders.
- Certified quality - IGI/GIA provided for all stones.
- Consistently receives excellent customer reviews on leading NYC directories.
10. Ada Diamonds
Ada Diamonds has become well-known for its luxury lab-grown engagement rings and high jewelry collections. While they have a strong online presence, their NYC service team supports custom retail orders and specialized designs.
Why Consider Them:
- Specialty in high-end, custom lab-grown jewelry.
- Actively pursues B-Corp status and uses recycled metals.
- Notable certifications - all diamonds IGI or GIA certified.
- Award-winning designs and recognized for sustainability leadership.
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How to Choose the Right Lab-Grown Diamonds Manufacturer?
Selecting the right diamond manufacturer is more than choosing who has the best price. Carefully assess capabilities, reliability, unique certifications, and support for your retail needs using this proven scoring matrix:
|
No. |
Criteria |
Weight (%) |
Scoring |
Notes for Evaluation |
|
1 |
Diamond Quality & Certification |
25% |
1 – 5 |
Check if all diamonds are IGI/GIA certified, color D–F, clarity VS2+ consistently. |
|
2 |
Manufacturing Capability & Technology |
15% |
1 – 5 |
Look for CVD Type IIa capability, fancy cuts, high volume capacity. |
|
3 |
Ethical & Environmental Compliance |
10% |
1 – 5 |
Ensure verified conflict-free, eco-friendly production, sustainability certifications. |
|
4 |
Supply Chain & Logistics |
10% |
1 – 5 |
Check turnaround time, shipping efficiency, and stock availability. |
|
5 |
Pricing & Transparency |
15% |
1 – 5 |
Evaluate wholesale pricing, discounts, clarity of price structure, no hidden costs. |
|
6 |
Customization & Product Range |
10% |
1 – 5 |
Variety of shapes, fancy colors, jewelry mountings, private-label options. |
|
7 |
Reputation & Reliability |
10% |
1 – 5 |
Based on industry references, reviews, and years in operation. |
|
8 |
Customer Service & Support |
5% |
1 – 5 |
Account manager availability, technical advice, after-sales service. |
Final Thoughts!
New York City is a global diamond hub, and these 10 lab-grown diamond manufacturers stand out for their quality, technology, ethical practices, and commitment to serving retailers like you. Whether you’re looking for bulk loose stones, custom jewelry production, or premium private-label programs, these companies can give your business the edge it needs in a fast-evolving market.
By working with the right manufacturing partner, you’ll not only deliver beautiful, sustainable diamonds to your customers but also strengthen your brand’s reputation as a trusted and future-forward jewelry retailer. Use the scoring matrix to rank your options, match them with your unique priorities, and build a supply chain that supports your growth in the fast-moving lab-grown diamond industry.
Unable to Decide? Start with Solitaire Lab Diamond!
Our diamond experts love tackling custom requests and sourcing rare shapes that set your collection apart. Let’s collaborate to deliver certified, sustainable, and beautifully cut lab-grown diamonds your customers will love.