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.
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.
Why buyers source diamond jewelry from our Zhengzhou factory.
Our website already shows the advantages buyers care about most: direct factory supply, Type IIa lab-created diamonds, practical customization, and a product range built for wholesale 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.
How custom jewelry projects move from inquiry to production.
For brand buyers and custom orders, the biggest question is usually how to start. This process turns your factory capability into a clearer cooperation path.
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.
Real process images support the quality story better than generic claims.
Your own workshop and detail photos are a real advantage. For overseas buyers, these images help prove that the business is factory-based, hands-on, and suitable for repeat production.
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.
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.
Answer the practical questions buyers usually ask before ordering.
This final block is written for buyers who already have product interest but still want clarity on certification, OEM service, timing, and sample-first cooperation.
- Clarifies certification and production timing.
- Supports both loose stone and custom jewelry inquiries.
- Reduces hesitation before a serious contact request.
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.