Standard shapes: round, cushion, oval, princess
MPCVD gem-quality lab-grown loose diamond
Qiansheng Superhard Materials grows high-purity single-crystal lab-grown loose diamonds with an in-house MPCVD process, supplying rough and polished lab-grown diamonds to B2B customers in the jewelry industry under stable capacity and controllable parameters.
01
Core technical characteristics
Qiansheng Superhard Materials focuses on MPCVD lab-grown diamond technology. An in-house microwave plasma CVD process replaces the traditional hot-filament process, avoiding hot-filament contamination, with tightly controlled chamber environment, temperature, pressure, and gas ratios to grow high-purity single-crystal loose diamond.
Lab-grown diamonds are same as natural diamonds in crystal structure, physical properties, chemistry, and optical performance, with Mohs hardness 10, high refractive index, and vivid fire.
We produce rough diamond and cut-and-polished loose diamonds. Colorless diamonds and colored diamonds—light pink, cherry-blossom pink, yellow, and blue—can be controlled grown. Multiple shapes, colors, and sizes can be provided to fit the demand of jewelry market. For specialty requests such as desert-series lab-grown diamonds, please contact us.
Official scope of business
We grow lab-grown diamonds in-house and produce lab-grown loose diamonds only. We do not produce platinum or karat gold, do not set melee diamonds, and do not offer stone setting or finished jewelry manufacturing. After purchasing loose diamonds, customers may optionally use our digital jewelry design service (renderings and manufacturing drawings only; no physical jewelry is produced).
02
Core product parameters
| Item | Parameter notes |
|---|---|
| Product category | MPCVD gem-quality single-crystal lab-grown diamond (rough / cut and polished loose diamond) |
| Crystal hardness | Mohs 10 (same hardness class as natural diamond) |
| Quality standard | Strictly follows the international diamond 4Cs grading system (Carat/Color/Clarity/Cut), with full parameter traceability |
| Grading reports | IGI and NGTC third-party grading reports available on request |
| Key advantages | No hot-filament contamination, high-purity single crystal, excellent fire, stable lot quality, directed fancy-color growth available |
03
Specifications and customization
Color series
Colored diamonds: light pink, cherry-blossom pink, yellow, blue, and other mainstream colored diamonds
Regular range: 1ct–5ct
Customization
Quality control: agreed color tolerances for colored diamonds and strict control of batch color variation
04
Manufacturing capability
- In-house core process: full MPCVD growth, sorting, and QC stack under our control—no external process dependency, strong quality controllability;
- Precise parameter customization: carat, color, clarity, and cut can be locked to customer requirements for directed production;
- Full-category delivery: diamond rough feedstock and cut-and-polished loose diamonds—two modes matching different customer production needs;
- Stable volume capacity: a scaled equipment matrix supports ongoing bulk supply for jewelry brands and traders;
- Strict QC system: full-chain control from growth, screening, grading, and recheck—impurities and defective stones are blocked from shipment.
05
Core application scenarios
We focus on B2B customers across the jewelry supply chain, covering these commercial scenarios:
- Custom fine jewelry: bespoke programs and colored-diamond light-luxury collections
- Factory bulk stock: bulk loose-diamond feedstock for jewelry factories and subsequent stone setting
- Brand new-product development: new collections, order-meeting selection, and online/offline listing
- Wholesale: loose-diamond wholesale circulation and inventory turnover
- Research and process R&D: superhard-materials research experiments and advanced process development
- Light-luxury collection development: fancy-color light-luxury lines and custom product lines
Customers: jewelry factories, high-end custom studios, jewelry brands, and loose-diamond wholesalers
06
Quality inspection and control
- Full-chain traceability: real-time growth monitoring, manual precision sorting, finished grading recheck, and inbound archival logging—end-to-end traceable;
- International grading: the globally used diamond 4Cs standard is applied strictly; each loose diamond has clear parameters and precise grades;
- Third-party grading reports: IGI and NGTC dual grading available; compliance and professionalism assured;
- Strict outgoing QC: optical, appearance, and parameter checks before shipment to protect downstream product quality stability.
We specialize in R&D and volume production of gem-quality MPCVD lab-grown loose diamonds—source-factory direct supply with no middleman markup, supporting parameter customization, bulk orders, and sample trials.
For latest product parameters, loose-diamond quotations, bulk-supply plans, or fancy-color custom inquiries, submit the website inquiry form or contact our sales team directly.
Optional value-added service: jewelry custom digital drawings and high-resolution rendering design