Chengye Tech Inc
Lab-Grown Diamond Technology
HPHT Annealing · CVD Lab-Grown Diamonds

Enhancing CVD Diamonds with Precision HPHT Technology

Chengye Tech Inc partners with lab-grown diamond growers worldwide, providing advanced HPHT annealing and color engineering solutions to transform CVD diamonds into high-value, fancy color stones.

Since 2002 First worldwide patent on HPHT treatment of CVD diamonds.
Global Clients Serving USA, China, India, EU and other major diamond hubs.
HPHT annealing for CVD stones
Fancy pink & red diamonds
Fancy yellow & blue colors
Who we are

Pioneers in HPHT Treatment of CVD Diamonds

Chengye Tech Inc grew out of early collaborative research with scientists at the Carnegie Institution of Washington, advancing the science of lab-grown diamond color enhancement.

Scientific roots, industrial impact

We conducted the first research on HPHT annealing of CVD lab-grown diamonds in collaboration with scientists at the Carnegie Institution of Washington, and obtained the first worldwide patent on treatment to enhance the color of CVD diamonds in 2002.

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Patented technology
Our patented HPHT process unlocks the hidden potential of CVD diamonds, enabling stable, attractive colors and improved optical performance for our clients.
20+ yrs Experience in lab-grown diamond technology and color engineering.
Global Clients across USA, China, India, EU and other regions.
R&D Continuous process optimization and value-added technical support.
Reissued patent related to CVD diamond treatment
Early patent on methods for enhancing the color of CVD diamonds through HPHT treatment.
What we do

Advanced Services for Lab-Grown Diamond Growers

From color improvement to tailored fancy hues, we provide HPHT annealing and value-added technology services that help our partners capture more value from their CVD production.

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HPHT Annealing for CVD Diamonds

High-pressure, high-temperature treatment designed specifically for CVD-grown diamonds to enhance color and optical properties while maintaining the integrity of the crystal.

Color enhancement Optical performance Process optimization
②

Fancy Color Stone Development

We help our clients create high-value fancy colors, including fancy pink/red, fancy yellow and fancy blue stones, through refined HPHT-based processes.

Fancy pink & red Fancy yellow Fancy blue
③

Value-Added Technology Solutions

Beyond processing, we offer know-how, process design support and technical consulting to help growers improve yields, consistency and product positioning.

Technology transfer Custom solutions Global support
Technology

From CVD Growth to High-Value Color Diamonds

Our patented HPHT annealing processes are built on fundamental research into defects and color centers in diamond, translated into reliable industrial workflows.

Typical treatment flow

HPHT Annealing
Single crystal CVD diamond is heated at high temperature and high pressure to modify internal defect structures and base color.
Irradiation & Follow-up Annealing
Carefully controlled irradiation and secondary annealing can generate desirable color centers while preserving clarity.
Cutting & Polishing
Final cutting and polishing reveal the full beauty of the enhanced CVD diamond as a finished gemstone.
Each client benefits from process parameters tuned to their own CVD material, enabling consistent results and competitive differentiation in the lab-grown diamond market.
Process flow of annealing, irradiation and polishing of lab-grown diamonds
Schematic of a CVD diamond as it moves through HPHT annealing, irradiation, additional annealing, and final cutting and polishing.
Contact

Connect with Chengye Tech Inc

Reach out to discuss HPHT annealing services, fancy color development, or value-added technology solutions for your CVD production.

Business contact

For service inquiries and technical collaboration, please contact:

  • Contact
    Wei (Bill) Li, PhD
  • Phone
    +1 858-305-4980
  • Address
    B-9171 Wilshire Blvd., Ste 500
    Beverly Hills, CA 90210 USA
We serve clients in the USA, China, India, EU and other regions, and are open to new collaborations with CVD diamond growers and partners worldwide.

Request more information

Send us a brief message and we will follow up to learn more about your CVD material and how we can help.