Wentworth Diamonds — Source Manufacturer for Lab-Grown Diamond Jewelry
Based in Zhengzhou, China, Wentworth Diamonds is a direct-to-buyer manufacturer specializing in lab-grown loose diamonds and finished diamond jewelry. With over a decade of production expertise, we serve wholesale buyers, jewelry retailers, distributors, and OEM/ODM brands worldwide.
Our factory covers the complete jewelry production chain — from diamond selection and grading through CAD design, casting, stone setting, polishing, and final quality inspection. Every piece ships with the consistency and precision that B2B buyers require for repeat orders.
Your Trusted Source for Premium Lab-Grown Diamonds.
We combine direct factory pricing with uncompromising quality. Specializing in Type IIa lab-created diamonds and versatile wholesale collections, we provide the reliability, consistency, and customization depth that growing jewelry brands demand.
Years of diamond manufacturing experience.
Business days for standard loose stone dispatch.
Days for custom jewelry production depending on design.
- Loose diamond sizes from small melee to larger center stones for different retail programs.
- Type IIa lab-created diamond positioning already matches your premium wholesale story.
- IGI and GIL-USA support for buyers who need stronger quality and sales confidence.
- Suitable for wholesalers, jewelry stores, distributors, and OEM or ODM buyers.
Browse diamonds and jewelry by category.
Explore our full range of lab-grown loose diamonds, finished jewelry styles, and custom options. Use the category tabs below to find exactly what your business needs.
Seamless Custom Jewelry Manufacturing.
Bringing your unique vision to life is simple. Our streamlined cooperation process ensures clear communication, precise sampling, and efficient mass production tailored to your brand's exact specifications.
Send Your Requirement
Share reference photos, CAD ideas, stone quality requirements, metal choice, target quantity, or your own concept.
Quotation and Matching
We match your request with available styles or recommend a custom route based on product target, budget, and order volume.
Sample Confirmation
Confirm stone presentation, setting details, finish, and overall product fit before moving into larger production orders.
Production and Shipment
Move into organized production, quality inspection, and export shipment for your destination market.
What buyers can customize with us.
- Diamond shape, size, color, clarity, and certification direction.
- 9K, 10K, 14K, 18K, Platinum, Silver, and other metal options.
- Solitaire, halo, pave, micro-pave, and multi-stone setting styles.
- Engraving, finish, logo details, and branded packaging support.
- Sample-first cooperation for lower sourcing risk.
Transparency in Every Step of Production.
We believe true quality speaks for itself. From precise stone setting to final polishing, our in-house manufacturing facility ensures strict quality control. Explore our workshop and see the meticulous attention to detail behind every piece.
Precision work for finished jewelry.
Close-up setting details help buyers judge finish quality before they ask for pricing or samples.
Consistency matters for repeat orders.
Inspection visuals support buyers who care about consistency across future reorders and broader collections.
Custom structure and frame preparation.
Production-stage images make OEM and ODM projects feel more credible and less risky.
Every piece is checked before shipment.
Better for overseas buyers who need more confidence before ordering remotely from China.
Connecting with partners at international jewelry trade shows.
We regularly participate in major global exhibitions to showcase our latest collections, meet buyers face-to-face, and stay ahead of industry trends.
Ready to discuss your next loose diamond or jewelry order?
If you are sourcing lab-grown loose diamonds, ready-to-sell jewelry, or custom private label products, send us your requirements and we can discuss pricing and production.
Everything You Need to Know Before Partnering With Us.
We value transparent and efficient communication. Find quick answers to common questions regarding diamond certification, custom manufacturing timelines, and our sample policies.
- IGI & GIL-USA Certification Details
- OEM/ODM Customization Scope
- Production & Shipping Timelines
Are your diamonds certified?
Yes. We support certification from recognized laboratories such as IGI and GIL-USA, which helps wholesale buyers present clearer quality assurance to their own customers.
Do you offer OEM and ODM services?
Yes. We support OEM and ODM jewelry projects, including metal selection, setting style, stone matching, engraving, and packaging direction for private label buyers.
How fast can standard and custom orders move?
Standard loose stones can move more quickly, while custom jewelry production depends on design complexity, quantity, and confirmation steps. Clear timing helps buyers plan stock and launch schedules better.
Can I start with a sample before bulk orders?
Yes. Sample-first cooperation is a good option for buyers who want to verify craftsmanship, finish quality, and overall product fit before moving into larger production orders.