Start From Where Your Project Is Today
Whether you already have complete specifications or need help developing an initial concept, we provide the design,
diamond processing, sampling, and production support required to move your project forward.
Manufacture from Your Specifications
OEM Manufacturing
Already have diamond specifications, jewelry drawings, CAD files, technical requirements, or a physical sample? We can review your requirements, develop an approval sample, and manufacture the confirmed product with consistent specifications for volume production.
Suitable for:
• Custom-cut loose diamonds
• Jewelry produced from drawings or CAD files
• Sample-based manufacturing
• Private-label products and packaging
• Repeat production of established designs
Develop a New Product with Us
ODM Development
Have a brand direction, target market, product idea, or custom diamond project but no production-ready design? Our team can help define the product, develop the diamond and jewelry solution, create prototypes, and prepare the approved concept for scalable production.
Suitable for:
• Original jewelry collections
• New lab-grown diamond product lines
• Cultural and creative diamond products
• Branded or IP-based projects
• Memorial and other custom diamond programs
Diamond Specification Customization
We produce lab-grown diamonds in exact specifications, including carat, shape, color, clarity, and cut. Every diamond
is manufactured with strict grading control to ensure consistent quality for your brand.
Diamond Cuts
Carat Size
Clarity Grade
(F / IF)
( VVS1 / VVS2)
( VS1 / VS2)
( S1 / S2 / S3)
( I1 / I2 / I3)
Color Options
• G–J (Near Colorless)
• K–M (Faint Yellow)
• N–R (Light Yellow)
• S–Z (Yellow)
• Pink
• Blue
• Green
• Custom hues available upon request
Jewelry Manufacturing Capabilities
Our master designers and craftsmen create jewelry designs and handle
settings to shape both the visual style and structural integrity.
Jewelry Categories
Jewelry Setting Styles
What We Can Develop
From jewelry collections to cultural products and branded programs, we transform lab-grown
diamond concepts into fully developed, production-ready solutions.
- Branded Jewelry Collections
- Cultural & Creative Products
- Custom Diamond Programs
Develop a Memorial Diamond Program for Your Market
Partner with us to develop customized memorial diamond services for human and pet remembrance. From the preparation of eligible carbon-bearing materials to HPHT diamond growth, cutting, jewelry design, traceability, and branded presentation, each program can be adapted to your market and service model.
Private-Label Branding & Packaging
We help you build a complete private-label experience, from branded jewelry and certificates
to custom packaging that reflects your brand identity.
Selected Custom Works
Explore a selection of finished lab-grown diamond products that demonstrate the design,
diamond, material, and manufacturing options available for custom orders.
Certified Custom Lab-Grown Diamond Manufacturer
Why Choose HN LGD TC. as Your Lab-Grown Diamond Partner
Founded in Henan, China's leading lab-grown diamond industrial cluster, we operate an integrated
supply chain covering diamond production, cutting, grading, and jewelry manufacturing.
80,000+ ct
Loose Diamond Inventory
01
30,000+ ct
Annual Loose Diamond Capacity
02
3,000+
Experienced Diamond Craftsmen
03
200+
Professional Jewelry Designers
04
RMB 15 Billion
5-Year Cumulative Transaction Value
05
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In-House Cutting & Polishing Capacity
Our cutting and polishing factory operates with 50+ laser cutting machines and 100+ experienced polishers, supporting more than 30,000 carats of monthly processing capacity with consistent precision for bulk orders.
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Certified Quality Assurance
Standardized grading and inspection systems ensure consistent diamond quality at every stage. IGI, GIA, and NGTC certification support is available upon request.
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Established Distribution & Partner Network
Our nationwide distribution network and exhibition hubs in Shanghai, Beijing, and Shenzhen connect lab-grown diamond resources with jewellery brands, retailers, and manufacturers. Explore how you can join our network and grow with us.
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Broad Product Range, More Sourcing Options
Our extensive selection of lab-grown loose diamonds and finished jewellery gives buyers greater choice across shapes, carat ranges, grades, and styles. Explore our products to build a supply mix suited to your market.
Frequently Asked Questions
Q: How are your lab-grown diamonds made?
Our diamonds are produced using two main methods: HPHT and CVD.
• HPHT: recreates the natural conditions of diamond formation with high pressure and heat.
• CVD: grows diamonds gradually from carbon-rich gases in a controlled environment.
Q: Can I customize shape, size, and color?
Yes. We offer a wide range of shapes, including round, princess, emerald, pear, and others. Sizes and colors can also be tailored, from colorless grades to fancy options like blue, pink, or yellow.
Q: Do your diamonds come with certification?
Yes. Certification is available upon request. We work with IGI, GIA, and NGTC depending on the project. Each diamond is evaluated across the 4Cs, and grading reports can be provided when required.
Q: Can I request samples before production?
Of course! Samples can be arranged before mass production. In most cases, a sample fee applies depending on the design and materials. This is typically credited back once the production order is confirmed.
Q: How long does production usually take?
For loose diamonds, production typically takes 15 to 20 days. For jewelry or ODM projects, the lead time is usually around 30 days, depending on complexity and order volume.
Q: How do I start an ODM project with you?
It usually begins with a simple idea, a reference, or a target market. From there, we help shape the concept, define the product direction, and move into design and sampling.
Bring Your Lab-Grown Diamond Jewelry Idea to Life
Work with HN LGD TC. to develop custom diamond specifications and jewelry designs, with sample support and tailored production solutions.